* adds a rewrite of the tapi drivers + sip app. this is the result of lars' gsoc 2010 project, Thanks !

SVN-Revision: 23840

20 files changed, 2736 insertions, 0 deletions

diff --git a/package/tapi_sip/Makefile b/package/tapi_sip/Makefile
new file mode 100644
index 0000000..7a3d676
--- /dev/null
+++ b/package/tapi_sip/Makefile
@@ -0,0 +1,41 @@
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=tapi_sip
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/tapi_sip
+  SECTION:=utils
+  CATEGORY:=Utilities
+  TITLE:=tapi_sip
+  DEPENDS:=+libuci +libtapi +pjsip +kmod-lqtapi
+endef
+
+define Build/Prepare
+	mkdir -p $(PKG_BUILD_DIR)
+	$(CP) ./src/* $(PKG_BUILD_DIR)/
+endef
+
+define Build/Compile
+	CFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" \
+	LDFLAGS="$(TARGET_LDFLAGS)" \
+	$(MAKE) -C $(PKG_BUILD_DIR) \
+		$(TARGET_CONFIGURE_OPTS)
+endef
+
+define Package/tapi_sip/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/tapi-sip $(1)/usr/bin/
+
+	$(INSTALL_DIR) $(1)/etc/config $(1)/etc/init.d
+	$(INSTALL_DATA) ./files/telephony.conf $(1)/etc/config/telephony
+	$(INSTALL_BIN) ./files/telephony.init $(1)/etc/init.d/telephony
+endef
+
+$(eval $(call BuildPackage,tapi_sip))
diff --git a/package/tapi_sip/files/telephony.conf b/package/tapi_sip/files/telephony.conf
new file mode 100644
index 0000000..6d87f45
--- /dev/null
+++ b/package/tapi_sip/files/telephony.conf
@@ -0,0 +1,28 @@
+config 'config' 'config'
+#	option 'fw_url' 'http://192.168.1.100/danube_firmware.bin'
+	option 'fw_file' 'danube_firmware.bin'
+	option 'netdev'	'pppoe-wan'
+	option 'disable' '1'
+
+config 'account' 'account'
+	option 'realm' 'example.com'
+	option 'username' 'user'
+	option 'password' 'password'
+	option 'stun_host' 'stun.example.com'
+	option 'stun_port' '3478'
+	option 'sip_port' '5600'
+
+config 'contact'
+	option 'name' 'sip example'
+	option 'identifier' 'sip:user@example.net'
+	option 'number' '123'
+
+config 'contact'
+	option 'name'	'local1'
+	option 'identifier' 'tel:1'
+	option 'number' '01'
+
+config 'contact'
+	option 'name'	'local2'
+	option 'identifier' 'tel:2'
+	option 'number' '02'
diff --git a/package/tapi_sip/files/telephony.init b/package/tapi_sip/files/telephony.init
new file mode 100755
index 0000000..082024c
--- /dev/null
+++ b/package/tapi_sip/files/telephony.init
@@ -0,0 +1,50 @@
+#!/bin/sh /etc/rc.common
+START=80
+
+download_fw()
+{
+	config_load telephony
+	config_get fw_url config fw_url
+	config_get fw_file config fw_file
+	wget $fw_url -O /tmp/$fw_file || {
+		echo "failed to load $fw_url"
+		exit 1
+	}
+}
+
+load_module()
+{
+	M=`lsmod | grep vmmc`
+	[ -z "$M" ] || return
+	config_load telephony
+	config_get fw_file config fw_file
+	[ -z "fw_file" ] && exit 1
+	F=/lib/firmware/$fw_file
+	[ ! -f "$F" -a ! -L "$F" ] && {
+		echo "missing firmware file"
+		exit 1
+	}
+	[ -L "$F" -a -f /tmp/$fw_file ] && F=/tmp/$fw_file
+	insmod vmmc
+	sleep 3
+}
+
+stop()
+{
+	killall tapi-sip 2>/dev/null
+}
+
+start()
+{
+	stop
+	config_load telephony
+	config_get fw_url config fw_url
+	config_get fw_file config fw_file
+	config_get netdev config netdev
+	config_get disable config disable
+	[ "$disable" != "1" ]  && {
+		[ ! -z "$fw_url" -a ! -f "/tmp/$fw_file" ] && download_fw
+		load_module
+		/usr/bin/tapi-sip $netdev &
+	}
+}
diff --git a/package/tapi_sip/src/Makefile b/package/tapi_sip/src/Makefile
new file mode 100644
index 0000000..5601370
--- /dev/null
+++ b/package/tapi_sip/src/Makefile
@@ -0,0 +1,21 @@
+ifndef CFLAGS
+CFLAGS = -O2 -g -I ../src
+endif
+
+CFLAGS += -Werror -Wall -std=gnu99
+
+PJ_CFLAGS ?= `pkg-config libpjproject --cflags`
+PJ_LDFLAGS ?= `pkg-config libpjproject --libs`
+
+CFLAGS += $(PJ_CFLAGS)
+LDFLAGS += $(PJ_LDFLAGS)
+
+FPIC=-fPIC
+
+all: tapi-sip
+
+%.o: %.c
+	$(CC) -c -o $@ $^ $(CFLAGS)
+
+tapi-sip: contact.o session.o tapi_agent.o tapi_sip.o sip_client.o stun.o dialdetector.o
+	$(CC) -o $@ $^ -ltapi -luci $(LDFLAGS)
diff --git a/package/tapi_sip/src/agent.h b/package/tapi_sip/src/agent.h
new file mode 100644
index 0000000..7959941
--- /dev/null
+++ b/package/tapi_sip/src/agent.h
@@ -0,0 +1,41 @@
+#ifndef __AGENT_H__
+#define __AGENT_H__
+
+#include "agent.h"
+
+struct session;
+struct agent;
+
+struct agent_ops {
+	int (*invite)(struct agent *, struct session *);
+	int (*accept)(struct agent *, struct session *);
+	int (*hangup)(struct agent *, struct session *);
+
+	int (*get_endpoint)(struct agent *, struct session *);
+};
+
+struct agent {
+	const struct agent_ops *ops;
+};
+
+static inline int agent_invite(struct agent *agent, struct session *session)
+{
+	return agent->ops->invite(agent, session);
+}
+
+static inline int agent_accept(struct agent *agent, struct session *session)
+{
+	return agent->ops->accept(agent, session);
+}
+
+static inline int agent_hangup(struct agent *agent, struct session *session)
+{
+	return agent->ops->hangup(agent, session);
+}
+
+static inline int agent_get_endpoint(struct agent *agent, struct session *session)
+{
+	return agent->ops->get_endpoint(agent, session);
+}
+
+#endif
diff --git a/package/tapi_sip/src/contact.c b/package/tapi_sip/src/contact.c
new file mode 100644
index 0000000..eeb38b4
--- /dev/null
+++ b/package/tapi_sip/src/contact.c
@@ -0,0 +1,162 @@
+#include <malloc.h>
+#include <string.h>
+
+#include <uci.h>
+#include <ucimap.h>
+
+#include "list.h"
+#include "contact.h"
+
+static struct uci_context *ctx;
+static struct uci_package *pkg;
+static struct list_head contact_list;
+static struct list_head account_list;
+
+static int contact_init(struct uci_map *map, void *section,
+	struct uci_section *s)
+{
+    struct contact *p = section;
+	p->name = strdup(s->e.name);
+	return 0;
+}
+
+static int contact_add(struct uci_map *map, void *section)
+{
+    struct contact *c = section;
+	printf("add contact: %s\n", c->name);
+	list_add_tail(&c->head, &contact_list);
+	return 0;
+}
+
+static struct uci_optmap contact_uci_map[] = {
+	{
+		UCIMAP_OPTION(struct contact, identifier),
+		.type = UCIMAP_STRING,
+		.name = "identifier",
+	},
+	{
+		UCIMAP_OPTION(struct contact, number),
+		.type = UCIMAP_STRING,
+		.name = "number",
+	},
+};
+
+static struct uci_sectionmap contact_sectionmap = {
+	UCIMAP_SECTION(struct contact, map),
+	.type = "contact",
+	.init = contact_init,
+	.add = contact_add,
+	.options = contact_uci_map,
+	.n_options = ARRAY_SIZE(contact_uci_map),
+	.options_size = sizeof(struct uci_optmap),
+};
+
+static int account_init(struct uci_map *map, void *section,
+	struct uci_section *s)
+{
+    struct account *a = section;
+	a->name = strdup(s->e.name);
+	return 0;
+}
+
+static int account_add(struct uci_map *map, void *section)
+{
+    struct account *a = section;
+	list_add_tail(&a->head, &account_list);
+	return 0;
+}
+
+static struct uci_optmap account_uci_map[] = {
+	{
+		UCIMAP_OPTION(struct account, realm),
+		.type = UCIMAP_STRING,
+		.name = "realm",
+	},
+	{
+		UCIMAP_OPTION(struct account, username),
+		.type = UCIMAP_STRING,
+		.name = "username",
+	},
+	{
+		UCIMAP_OPTION(struct account, sip_port),
+		.type = UCIMAP_INT,
+		.name = "sip_port",
+	},
+	{
+		UCIMAP_OPTION(struct account, password),
+		.type = UCIMAP_STRING,
+		.name = "password",
+	},
+	{
+		UCIMAP_OPTION(struct account, stun_host),
+		.type = UCIMAP_STRING,
+		.name = "stun_host",
+	},
+	{
+		UCIMAP_OPTION(struct account, stun_port),
+		.type = UCIMAP_INT,
+		.name = "stun_port",
+	},
+};
+
+static struct uci_sectionmap account_sectionmap = {
+	UCIMAP_SECTION(struct account, map),
+	.type = "account",
+	.init = account_init,
+	.add = account_add,
+	.options = account_uci_map,
+	.n_options = ARRAY_SIZE(account_uci_map),
+	.options_size = sizeof(struct uci_optmap),
+};
+
+static struct uci_sectionmap *network_smap[] = {
+    &contact_sectionmap,
+	&account_sectionmap,
+};
+
+static struct uci_map contact_map = {
+	.sections = network_smap,
+	.n_sections = ARRAY_SIZE(network_smap),
+};
+
+int contacts_init(void)
+{
+	int ret;
+
+	INIT_LIST_HEAD(&contact_list);
+	INIT_LIST_HEAD(&account_list);
+	ctx = uci_alloc_context();
+
+	ucimap_init(&contact_map);
+	ret = uci_load(ctx, "telephony", &pkg);
+	if (ret)
+		return ret;
+
+	ucimap_parse(&contact_map, pkg);
+
+	return 0;
+}
+
+void contacts_free(void)
+{
+}
+
+struct contact *contact_get(const char *number)
+{
+	struct contact *contact;
+	list_for_each_entry(contact, &contact_list, head)
+	{
+		if (strcmp(contact->number, number) == 0)
+			return contact;
+	}
+
+	return NULL;
+}
+
+struct account *get_account(void)
+{
+	if (list_empty(&account_list))
+		return NULL;
+
+	return list_first_entry(&account_list, struct account, head);
+}
diff --git a/package/tapi_sip/src/contact.h b/package/tapi_sip/src/contact.h
new file mode 100644
index 0000000..1fb0037
--- /dev/null
+++ b/package/tapi_sip/src/contact.h
@@ -0,0 +1,33 @@
+#ifndef __CONTACT_H__
+#define __CONTACT_H__
+
+#include <ucimap.h>
+
+struct account {
+	struct ucimap_section_data map;
+	const char *name;
+	char *realm;
+	char *username;
+	char *password;
+	int sip_port;
+	char *stun_host;
+	int stun_port;
+	struct list_head head;
+};
+
+struct contact {
+	struct ucimap_section_data map;
+	const char *name;
+	const char *identifier;
+	const char *number;
+
+	struct list_head head;
+};
+
+int contacts_init(void);
+void contacts_free(void);
+struct contact *contact_get(const char *number);
+
+struct account *get_account(void);
+
+#endif
diff --git a/package/tapi_sip/src/dialdetector.c b/package/tapi_sip/src/dialdetector.c
new file mode 100644
index 0000000..277b029
--- /dev/null
+++ b/package/tapi_sip/src/dialdetector.c
@@ -0,0 +1,148 @@
+#include <linux/input.h>
+#include <sys/epoll.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <events.h>
+#include "timerfd.h"
+
+#include "tapi-port.h"
+#include "dialdetector.h"
+
+static const struct itimerspec dialdetector_timeout = {
+	.it_value.tv_sec = 3,
+};
+
+static const struct itimerspec dialdetector_impulse_timeout = {
+	.it_value.tv_nsec = 200000000,
+};
+
+static void dialdetector_note_digit(struct dialdetector *d, unsigned char digit)
+{
+	printf("note digit: %d\n", d->num_digits);
+
+	d->digits[d->num_digits] = digit;
+	++d->num_digits;
+
+	timerfd_settime(d->timer_fd, 0, &dialdetector_timeout, NULL);
+	d->dial_state = DIALDETECTOR_DIAL_WAIT_TIMEOUT;
+}
+
+static void dialdetector_reset(struct dialdetector *d)
+{
+	d->num_digits = 0;
+	d->impulses = 0;
+	d->dial_state = DIALDETECTOR_DIAL_WAIT;
+	d->port_state = DIALDETECTOR_PORT_INACTIVE;
+}
+
+static bool dialdetector_timeout_event(int events, void *data)
+{
+	char num[20];
+	struct dialdetector *dialdetector = data;
+	int i;
+	uint64_t tmp;
+
+	read(dialdetector->timer_fd, &tmp, sizeof(tmp));
+
+	for (i = 0; i < dialdetector->num_digits; ++i) {
+		num[i] = '0' + dialdetector->digits[i];
+	}
+	num[i] = '\0';
+
+	dialdetector->dial_callback(dialdetector->port, dialdetector->num_digits,
+	dialdetector->digits);
+
+	dialdetector_reset(dialdetector);
+
+	return true;
+}
+
+static bool dialdetector_impulse_timeout_cb(int events, void *data)
+{
+	struct dialdetector *d = data;
+	uint64_t tmp;
+
+	read(d->impulse_timer_fd, &tmp, sizeof(tmp));
+
+	if (d->port_state == DIALDETECTOR_PORT_ACTIVE_DOWN) {
+		d->port_state = DIALDETECTOR_PORT_INACTIVE;
+	} else {
+		printf("impulse: %d\n", d->impulses);
+		if (d->impulses > 0)
+			dialdetector_note_digit(d, d->impulses < 10 ? d->impulses : 0);
+		d->impulses = 0;
+	}
+
+	return true;
+}
+
+static void dialdetector_port_event(struct tapi_port *port,
+	struct tapi_event *event, void *data)
+{
+	struct dialdetector *d = data;
+
+	printf("port event: %d %d\n", d->port_state, event->hook.on);
+
+	switch (d->port_state) {
+	case DIALDETECTOR_PORT_INACTIVE:
+		if (event->type == TAPI_EVENT_TYPE_HOOK && event->hook.on == false)
+			d->port_state = DIALDETECTOR_PORT_ACTIVE;
+		break;
+	case DIALDETECTOR_PORT_ACTIVE:
+		switch (event->type) {
+		case TAPI_EVENT_TYPE_HOOK:
+			if (event->hook.on == true) {
+				d->port_state = DIALDETECTOR_PORT_ACTIVE_DOWN;
+				timerfd_settime(d->impulse_timer_fd, 0, &dialdetector_impulse_timeout, NULL);
+			}
+			break;
+		case TAPI_EVENT_TYPE_DTMF:
+			dialdetector_note_digit(d, event->dtmf.code);
+			break;
+		}
+		break;
+	case DIALDETECTOR_PORT_ACTIVE_DOWN:
+		if (event->type == TAPI_EVENT_TYPE_HOOK && event->hook.on == false) {
+			timerfd_settime(d->timer_fd, 0, &dialdetector_timeout, NULL);
+			++d->impulses;
+			d->port_state = DIALDETECTOR_PORT_ACTIVE;
+		}
+		break;
+	}
+}
+
+struct dialdetector *dialdetector_alloc(struct tapi_port *port)
+{
+	struct dialdetector *dialdetector;
+	dialdetector = malloc(sizeof(*dialdetector));
+
+	dialdetector->timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
+	dialdetector->impulse_timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
+	dialdetector->port = port;
+	dialdetector->num_digits = 0;
+	dialdetector->impulses = 0;
+	dialdetector->dial_state = DIALDETECTOR_DIAL_WAIT;
+	dialdetector->port_state = DIALDETECTOR_PORT_INACTIVE;
+
+	dialdetector->timeout_cb.callback = dialdetector_timeout_event;
+	dialdetector->timeout_cb.data = dialdetector;
+	dialdetector->impulse_cb.callback = dialdetector_impulse_timeout_cb;
+	dialdetector->impulse_cb.data = dialdetector;
+
+	dialdetector->port_listener.callback = dialdetector_port_event;
+	dialdetector->port_listener.data = dialdetector;
+
+	tapi_port_register_event(port, &dialdetector->port_listener);
+
+	event_register(dialdetector->impulse_timer_fd, EPOLLIN,
+		&dialdetector->impulse_cb);
+	event_register(dialdetector->timer_fd, EPOLLIN, &dialdetector->timeout_cb);
+
+	return dialdetector;
+}
diff --git a/package/tapi_sip/src/dialdetector.h b/package/tapi_sip/src/dialdetector.h
new file mode 100644
index 0000000..c3737c3
--- /dev/null
+++ b/package/tapi_sip/src/dialdetector.h
@@ -0,0 +1,49 @@
+#include <linux/input.h>
+#include <sys/epoll.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "events.h"
+#include "timerfd.h"
+
+#include "tapi-port.h"
+
+enum dialdetector_dial_state {
+	DIALDETECTOR_DIAL_WAIT = 1,
+	DIALDETECTOR_DIAL_WAIT_TIMEOUT = 2,
+};
+
+enum dialdetector_port_state {
+	DIALDETECTOR_PORT_INACTIVE = 0,
+	DIALDETECTOR_PORT_ACTIVE = 1,
+	DIALDETECTOR_PORT_ACTIVE_DOWN = 2,
+};
+
+struct dialdetector {
+	enum dialdetector_dial_state dial_state;
+	enum dialdetector_port_state port_state;
+
+	struct tapi_port *port;
+	int timer_fd;
+	int impulse_timer_fd;
+
+	struct event_callback timeout_cb;
+	struct event_callback impulse_cb;
+	struct tapi_port_event_listener port_listener;
+
+	size_t num_digits;
+	unsigned char digits[20];
+
+	unsigned int impulses;
+
+	void (*dial_callback)(struct tapi_port *port, size_t num_digits, const unsigned char *digits);
+};
+
+
+struct tapi_port;
+
+struct dialdetector *dialdetector_alloc(struct tapi_port *port);
diff --git a/package/tapi_sip/src/list.h b/package/tapi_sip/src/list.h
new file mode 100644
index 0000000..2959a06
--- /dev/null
+++ b/package/tapi_sip/src/list.h
@@ -0,0 +1,601 @@
+#ifndef _LINUX_LIST_H
+#define _LINUX_LIST_H
+
+#include <stddef.h>
+/**
+ * container_of - cast a member of a structure out to the containing structure
+ * @ptr:	the pointer to the member.
+ * @type:	the type of the container struct this is embedded in.
+ * @member:	the name of the member within the struct.
+ *
+ */
+#ifndef container_of
+#define container_of(ptr, type, member) (			\
+	(type *)( (char *)ptr - offsetof(type,member) ))
+#endif
+
+
+/*
+ * Simple doubly linked list implementation.
+ *
+ * Some of the internal functions ("__xxx") are useful when
+ * manipulating whole lists rather than single entries, as
+ * sometimes we already know the next/prev entries and we can
+ * generate better code by using them directly rather than
+ * using the generic single-entry routines.
+ */
+
+struct list_head {
+	struct list_head *next, *prev;
+};
+
+#define LIST_HEAD_INIT(name) { &(name), &(name) }
+
+#define LIST_HEAD(name) \
+	struct list_head name = LIST_HEAD_INIT(name)
+
+static inline void INIT_LIST_HEAD(struct list_head *list)
+{
+	list->next = list;
+	list->prev = list;
+}
+
+/*
+ * Insert a new entry between two known consecutive entries.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_add(struct list_head *new,
+			      struct list_head *prev,
+			      struct list_head *next)
+{
+	next->prev = new;
+	new->next = next;
+	new->prev = prev;
+	prev->next = new;
+}
+
+/**
+ * list_add - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it after
+ *
+ * Insert a new entry after the specified head.
+ * This is good for implementing stacks.
+ */
+static inline void list_add(struct list_head *new, struct list_head *head)
+{
+	__list_add(new, head, head->next);
+}
+
+
+/**
+ * list_add_tail - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it before
+ *
+ * Insert a new entry before the specified head.
+ * This is useful for implementing queues.
+ */
+static inline void list_add_tail(struct list_head *new, struct list_head *head)
+{
+	__list_add(new, head->prev, head);
+}
+
+
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_del(struct list_head * prev, struct list_head * next)
+{
+	next->prev = prev;
+	prev->next = next;
+}
+
+/**
+ * list_del - deletes entry from list.
+ * @entry: the element to delete from the list.
+ * Note: list_empty() on entry does not return true after this, the entry is
+ * in an undefined state.
+ */
+static inline void list_del(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+	entry->next = NULL;
+	entry->prev = NULL;
+}
+
+/**
+ * list_replace - replace old entry by new one
+ * @old : the element to be replaced
+ * @new : the new element to insert
+ *
+ * If @old was empty, it will be overwritten.
+ */
+static inline void list_replace(struct list_head *old,
+				struct list_head *new)
+{
+	new->next = old->next;
+	new->next->prev = new;
+	new->prev = old->prev;
+	new->prev->next = new;
+}
+
+static inline void list_replace_init(struct list_head *old,
+					struct list_head *new)
+{
+	list_replace(old, new);
+	INIT_LIST_HEAD(old);
+}
+
+/**
+ * list_del_init - deletes entry from list and reinitialize it.
+ * @entry: the element to delete from the list.
+ */
+static inline void list_del_init(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+	INIT_LIST_HEAD(entry);
+}
+
+/**
+ * list_move - delete from one list and add as another's head
+ * @list: the entry to move
+ * @head: the head that will precede our entry
+ */
+static inline void list_move(struct list_head *list, struct list_head *head)
+{
+	__list_del(list->prev, list->next);
+	list_add(list, head);
+}
+
+/**
+ * list_move_tail - delete from one list and add as another's tail
+ * @list: the entry to move
+ * @head: the head that will follow our entry
+ */
+static inline void list_move_tail(struct list_head *list,
+				  struct list_head *head)
+{
+	__list_del(list->prev, list->next);
+	list_add_tail(list, head);
+}
+
+/**
+ * list_is_last - tests whether @list is the last entry in list @head
+ * @list: the entry to test
+ * @head: the head of the list
+ */
+static inline int list_is_last(const struct list_head *list,
+				const struct list_head *head)
+{
+	return list->next == head;
+}
+
+/**
+ * list_empty - tests whether a list is empty
+ * @head: the list to test.
+ */
+static inline int list_empty(const struct list_head *head)
+{
+	return head->next == head;
+}
+
+/**
+ * list_empty_careful - tests whether a list is empty and not being modified
+ * @head: the list to test
+ *
+ * Description:
+ * tests whether a list is empty _and_ checks that no other CPU might be
+ * in the process of modifying either member (next or prev)
+ *
+ * NOTE: using list_empty_careful() without synchronization
+ * can only be safe if the only activity that can happen
+ * to the list entry is list_del_init(). Eg. it cannot be used
+ * if another CPU could re-list_add() it.
+ */
+static inline int list_empty_careful(const struct list_head *head)
+{
+	struct list_head *next = head->next;
+	return (next == head) && (next == head->prev);
+}
+
+static inline void __list_splice(struct list_head *list,
+				 struct list_head *head)
+{
+	struct list_head *first = list->next;
+	struct list_head *last = list->prev;
+	struct list_head *at = head->next;
+
+	first->prev = head;
+	head->next = first;
+
+	last->next = at;
+	at->prev = last;
+}
+
+/**
+ * list_splice - join two lists
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ */
+static inline void list_splice(struct list_head *list, struct list_head *head)
+{
+	if (!list_empty(list))
+		__list_splice(list, head);
+}
+
+/**
+ * list_splice_init - join two lists and reinitialise the emptied list.
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ *
+ * The list at @list is reinitialised
+ */
+static inline void list_splice_init(struct list_head *list,
+				    struct list_head *head)
+{
+	if (!list_empty(list)) {
+		__list_splice(list, head);
+		INIT_LIST_HEAD(list);
+	}
+}
+
+/**
+ * list_entry - get the struct for this entry
+ * @ptr:	the &struct list_head pointer.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_entry(ptr, type, member) \
+	container_of(ptr, type, member)
+
+/**
+ * list_first_entry - get the first element from a list
+ * @ptr:	the list head to take the element from.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Note, that list is expected to be not empty.
+ */
+#define list_first_entry(ptr, type, member) \
+	list_entry((ptr)->next, type, member)
+
+/**
+ * list_for_each	-	iterate over a list
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @head:	the head for your list.
+ */
+#define list_for_each(pos, head) \
+	for (pos = (head)->next; pos != (head); \
+        	pos = pos->next)
+
+/**
+ * __list_for_each	-	iterate over a list
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @head:	the head for your list.
+ *
+ * This variant differs from list_for_each() in that it's the
+ * simplest possible list iteration code, no prefetching is done.
+ * Use this for code that knows the list to be very short (empty
+ * or 1 entry) most of the time.
+ */
+#define __list_for_each(pos, head) \
+	for (pos = (head)->next; pos != (head); pos = pos->next)
+
+/**
+ * list_for_each_prev	-	iterate over a list backwards
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @head:	the head for your list.
+ */
+#define list_for_each_prev(pos, head) \
+	for (pos = (head)->prev; pos != (head); \
+        	pos = pos->prev)
+
+/**
+ * list_for_each_safe - iterate over a list safe against removal of list entry
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @n:		another &struct list_head to use as temporary storage
+ * @head:	the head for your list.
+ */
+#define list_for_each_safe(pos, n, head) \
+	for (pos = (head)->next, n = pos->next; pos != (head); \
+		pos = n, n = pos->next)
+
+/**
+ * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @n:		another &struct list_head to use as temporary storage
+ * @head:	the head for your list.
+ */
+#define list_for_each_prev_safe(pos, n, head) \
+	for (pos = (head)->prev, n = pos->prev; \
+	     pos != (head); \
+	     pos = n, n = pos->prev)
+
+/**
+ * list_for_each_entry	-	iterate over list of given type
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry(pos, head, member)				\
+	for (pos = list_entry((head)->next, typeof(*pos), member);	\
+	     &pos->member != (head); 	\
+	     pos = list_entry(pos->member.next, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_reverse - iterate backwards over list of given type.
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_reverse(pos, head, member)			\
+	for (pos = list_entry((head)->prev, typeof(*pos), member);	\
+	     &pos->member != (head); 	\
+	     pos = list_entry(pos->member.prev, typeof(*pos), member))
+
+/**
+ * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue()
+ * @pos:	the type * to use as a start point
+ * @head:	the head of the list
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Prepares a pos entry for use as a start point in list_for_each_entry_continue().
+ */
+#define list_prepare_entry(pos, head, member) \
+	((pos) ? : list_entry(head, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_continue - continue iteration over list of given type
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Continue to iterate over list of given type, continuing after
+ * the current position.
+ */
+#define list_for_each_entry_continue(pos, head, member) 		\
+	for (pos = list_entry(pos->member.next, typeof(*pos), member);	\
+	     &pos->member != (head);	\
+	     pos = list_entry(pos->member.next, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_continue_reverse - iterate backwards from the given point
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Start to iterate over list of given type backwards, continuing after
+ * the current position.
+ */
+#define list_for_each_entry_continue_reverse(pos, head, member)		\
+	for (pos = list_entry(pos->member.prev, typeof(*pos), member);	\
+	     &pos->member != (head);	\
+	     pos = list_entry(pos->member.prev, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_from - iterate over list of given type from the current point
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Iterate over list of given type, continuing from current position.
+ */
+#define list_for_each_entry_from(pos, head, member) 			\
+	for (; &pos->member != (head);	\
+	     pos = list_entry(pos->member.next, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @pos:	the type * to use as a loop cursor.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_safe(pos, n, head, member)			\
+	for (pos = list_entry((head)->next, typeof(*pos), member),	\
+		n = list_entry(pos->member.next, typeof(*pos), member);	\
+	     &pos->member != (head); 					\
+	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+/**
+ * list_for_each_entry_safe_continue
+ * @pos:	the type * to use as a loop cursor.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Iterate over list of given type, continuing after current point,
+ * safe against removal of list entry.
+ */
+#define list_for_each_entry_safe_continue(pos, n, head, member) 		\
+	for (pos = list_entry(pos->member.next, typeof(*pos), member), 		\
+		n = list_entry(pos->member.next, typeof(*pos), member);		\
+	     &pos->member != (head);						\
+	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+/**
+ * list_for_each_entry_safe_from
+ * @pos:	the type * to use as a loop cursor.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Iterate over list of given type from current point, safe against
+ * removal of list entry.
+ */
+#define list_for_each_entry_safe_from(pos, n, head, member) 			\
+	for (n = list_entry(pos->member.next, typeof(*pos), member);		\
+	     &pos->member != (head);						\
+	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+/**
+ * list_for_each_entry_safe_reverse
+ * @pos:	the type * to use as a loop cursor.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Iterate backwards over list of given type, safe against removal
+ * of list entry.
+ */
+#define list_for_each_entry_safe_reverse(pos, n, head, member)		\
+	for (pos = list_entry((head)->prev, typeof(*pos), member),	\
+		n = list_entry(pos->member.prev, typeof(*pos), member);	\
+	     &pos->member != (head); 					\
+	     pos = n, n = list_entry(n->member.prev, typeof(*n), member))
+
+/*
+ * Double linked lists with a single pointer list head.
+ * Mostly useful for hash tables where the two pointer list head is
+ * too wasteful.
+ * You lose the ability to access the tail in O(1).
+ */
+
+struct hlist_head {
+	struct hlist_node *first;
+};
+
+struct hlist_node {
+	struct hlist_node *next, **pprev;
+};
+
+#define HLIST_HEAD_INIT { .first = NULL }
+#define HLIST_HEAD(name) struct hlist_head name = {  .first = NULL }
+#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
+static inline void INIT_HLIST_NODE(struct hlist_node *h)
+{
+	h->next = NULL;
+	h->pprev = NULL;
+}
+
+static inline int hlist_unhashed(const struct hlist_node *h)
+{
+	return !h->pprev;
+}
+
+static inline int hlist_empty(const struct hlist_head *h)
+{
+	return !h->first;
+}
+
+static inline void __hlist_del(struct hlist_node *n)
+{
+	struct hlist_node *next = n->next;
+	struct hlist_node **pprev = n->pprev;
+	*pprev = next;
+	if (next)
+		next->pprev = pprev;
+}
+
+static inline void hlist_del(struct hlist_node *n)
+{
+	__hlist_del(n);
+	n->next = NULL;
+	n->pprev = NULL;
+}
+
+static inline void hlist_del_init(struct hlist_node *n)
+{
+	if (!hlist_unhashed(n)) {
+		__hlist_del(n);
+		INIT_HLIST_NODE(n);
+	}
+}
+
+
+static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
+{
+	struct hlist_node *first = h->first;
+	n->next = first;
+	if (first)
+		first->pprev = &n->next;
+	h->first = n;
+	n->pprev = &h->first;
+}
+
+
+/* next must be != NULL */
+static inline void hlist_add_before(struct hlist_node *n,
+					struct hlist_node *next)
+{
+	n->pprev = next->pprev;
+	n->next = next;
+	next->pprev = &n->next;
+	*(n->pprev) = n;
+}
+
+static inline void hlist_add_after(struct hlist_node *n,
+					struct hlist_node *next)
+{
+	next->next = n->next;
+	n->next = next;
+	next->pprev = &n->next;
+
+	if(next->next)
+		next->next->pprev  = &next->next;
+}
+
+#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
+
+#define hlist_for_each(pos, head) \
+	for (pos = (head)->first; pos; pos = pos->next)
+
+#define hlist_for_each_safe(pos, n, head) \
+	for (pos = (head)->first; pos; pos = n)
+
+/**
+ * hlist_for_each_entry	- iterate over list of given type
+ * @tpos:	the type * to use as a loop cursor.
+ * @pos:	the &struct hlist_node to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry(tpos, pos, head, member)			 \
+	for (pos = (head)->first; pos &&				 \
+		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+	     pos = pos->next)
+
+/**
+ * hlist_for_each_entry_continue - iterate over a hlist continuing after current point
+ * @tpos:	the type * to use as a loop cursor.
+ * @pos:	the &struct hlist_node to use as a loop cursor.
+ * @member:	the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_continue(tpos, pos, member)		\
+	for (pos = (pos)->next; pos &&					\
+	     ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;});   \
+	     pos = pos->next)
+
+/**
+ * hlist_for_each_entry_from - iterate over a hlist continuing from current point
+ * @tpos:	the type * to use as a loop cursor.
+ * @pos:	the &struct hlist_node to use as a loop cursor.
+ * @member:	the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_from(tpos, pos, member)			 \
+	for (; pos &&			 \
+		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+	     pos = pos->next)
+
+/**
+ * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @tpos:	the type * to use as a loop cursor.
+ * @pos:	the &struct hlist_node to use as a loop cursor.
+ * @n:		another &struct hlist_node to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_safe(tpos, pos, n, head, member) 		 \
+	for (pos = (head)->first;					 \
+	     pos && ({ n = pos->next; 1; }) && 				 \
+		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+	     pos = n)
+
+#endif
diff --git a/package/tapi_sip/src/session.c b/package/tapi_sip/src/session.c
new file mode 100644
index 0000000..97f6f06
--- /dev/null
+++ b/package/tapi_sip/src/session.c
@@ -0,0 +1,84 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "agent.h"
+#include "session.h"
+
+#include <tapi-device.h>
+
+
+struct session
+{
+	struct agent *agents[2];
+
+	struct tapi_device *tdev;
+
+	void (*release)(struct session *);
+
+	int link;
+};
+
+struct session *session_alloc(struct tapi_device *dev, struct agent *caller,
+	struct agent *callee, void (*release)(struct session *))
+{
+	struct session *session;
+	int ret;
+
+	session = malloc(sizeof(*session));
+
+	session->tdev = dev;
+
+	session->agents[0] = caller;
+	session->agents[1] = callee;
+
+	ret = agent_invite(callee, session);
+	if (ret < 0) {
+		session_hangup(session, callee);
+		free(session);
+		return NULL;
+	}
+
+	session->release = release;
+
+	return session;
+}
+
+void session_accept(struct session *session, struct agent *agent)
+{
+	int ep[2];
+
+	printf("session_accept: %p %p\n", session, agent);
+	printf("session agents: %p %p\n", session->agents[0], session->agents[1]);
+	printf("session tdev: %p\n", session->tdev);
+
+	agent_accept(session->agents[0], session);
+
+	ep[0] = agent_get_endpoint(session->agents[0], session);
+	ep[1] = agent_get_endpoint(session->agents[1], session);
+	session->link = tapi_link_alloc(session->tdev, ep[0], ep[1]);
+
+	printf("eps: %d %d\n", ep[0], ep[1]);
+
+	tapi_link_enable(session->tdev, session->link);
+
+	tapi_sync(session->tdev);
+}
+
+void session_hangup(struct session *session, struct agent *agent)
+{
+	struct agent *other_agent;
+
+	if (session->agents[0] == agent)
+		other_agent = session->agents[1];
+	else
+		other_agent = session->agents[0];
+
+	agent_hangup(other_agent, session);
+
+	tapi_link_disable(session->tdev, session->link);
+	tapi_link_free(session->tdev, session->link);
+	tapi_sync(session->tdev);
+
+	if (session->release)
+		session->release(session);
+}
diff --git a/package/tapi_sip/src/session.h b/package/tapi_sip/src/session.h
new file mode 100644
index 0000000..7403785
--- /dev/null
+++ b/package/tapi_sip/src/session.h
@@ -0,0 +1,14 @@
+#ifndef __SESSION_H__
+#define __SESSION_H__
+
+struct agent;
+struct session;
+struct tapi_device;
+
+struct session *session_alloc(struct tapi_device *, struct agent *caller,
+	struct agent *callee, void (*release)(struct session *));
+void session_hangup(struct session *, struct agent *);
+void session_accept(struct session *, struct agent *);
+void session_free(struct session *);
+
+#endif
diff --git a/package/tapi_sip/src/sip_agent.h b/package/tapi_sip/src/sip_agent.h
new file mode 100644
index 0000000..7f711da
--- /dev/null
+++ b/package/tapi_sip/src/sip_agent.h
@@ -0,0 +1,27 @@
+#ifndef __SIP_AGENT_H__
+#define __SIP_AGENT_H__
+
+#include "agent.h"
+#include <events.h>
+
+struct sip_agent {
+	struct sip_client *client;
+	const char *identifier;
+
+	struct tapi_stream *stream;
+	struct session *session;
+
+	struct pjsip_inv_session *inv;
+
+	int rtp_sockfd;
+
+	struct sockaddr_storage remote_addr;
+	struct sockaddr_storage local_addr;
+
+	struct agent agent;
+
+	struct event_callback rtp_recv_callback;
+	struct event_callback stream_recv_callback;
+};
+
+#endif
diff --git a/package/tapi_sip/src/sip_client.c b/package/tapi_sip/src/sip_client.c
new file mode 100644
index 0000000..0b1e2dd
--- /dev/null
+++ b/package/tapi_sip/src/sip_client.c
@@ -0,0 +1,800 @@
+#include "sip_client.h"
+
+#include <stdint.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <sys/epoll.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+
+#include "stun.h"
+#include "sip_agent.h"
+#include "session.h"
+#include "list.h"
+
+static inline struct sip_agent *agent_to_sip_agent(struct agent *agent)
+{
+	return container_of(agent, struct sip_agent, agent);
+}
+
+static int iface_get_addr(const char *iface, struct sockaddr_storage *addr)
+{
+	int fd;
+	int ret;
+	struct ifreq ifr;
+
+	fd = socket(AF_INET, SOCK_DGRAM, 0);
+
+	ifr.ifr_addr.sa_family = AF_INET;
+	strncpy(ifr.ifr_name, iface, IFNAMSIZ-1);
+	ret = ioctl(fd, SIOCGIFADDR, &ifr);
+	if (ret < 0)
+		perror("Failed to get interface address");
+
+	close(fd);
+
+	if (ret == 0)
+		memcpy(addr, &ifr.ifr_addr, sizeof(ifr.ifr_addr));
+
+	return ret;
+}
+
+#if 0
+static bool sockaddr_is_local(struct sockaddr_storage *addr)
+{
+	unsigned long s_addr;
+	bool is_local = false;
+
+	switch (addr->ss_family) {
+	case AF_INET:
+		s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
+		if ((s_addr & 0xff000000) == 0x10000000)
+			is_local = true;
+		else if ((s_addr & 0xfff00000) == 0xac100000)
+			is_local = true;
+		else if ((s_addr & 0xffff0000) == 0xc0a80000)
+			is_local = true;
+		break;
+	default:
+		break;
+	}
+
+	return is_local;
+}
+#endif
+
+static uint16_t sockaddr_get_port(struct sockaddr_storage *addr)
+{
+	uint16_t port;
+
+	switch (addr->ss_family) {
+	case AF_INET:
+		port = ((struct sockaddr_in *)addr)->sin_port;
+		break;
+	case AF_INET6:
+		port = ((struct sockaddr_in6 *)addr)->sin6_port;
+		break;
+	default:
+		port = 0;
+		break;
+	}
+
+	return port;
+}
+
+static void sockaddr_set_port(struct sockaddr_storage *addr, uint16_t port)
+{
+	switch (addr->ss_family) {
+	case AF_INET:
+		((struct sockaddr_in *)addr)->sin_port = port;
+		break;
+	case AF_INET6:
+		((struct sockaddr_in6 *)addr)->sin6_port = port;
+		break;
+	default:
+		break;
+	}
+}
+
+static void *sockaddr_get_addr(struct sockaddr_storage *addr)
+{
+	void *a;
+	switch (addr->ss_family) {
+	case AF_INET:
+		a = &((struct sockaddr_in *)addr)->sin_addr.s_addr;
+		break;
+	case AF_INET6:
+		a = ((struct sockaddr_in6 *)addr)->sin6_addr.s6_addr;
+		break;
+	default:
+		a = NULL;
+		break;
+	}
+
+	return a;
+}
+
+static int sockaddr_to_string(struct sockaddr_storage *addr, char *s, size_t n)
+{
+	return inet_ntop(addr->ss_family, sockaddr_get_addr(addr), s, n) == NULL ? -1 : 0;
+}
+
+static pjsip_module mod_siprtp;
+static struct sip_client *global_client;
+
+/* Creates a datagram socket and binds it to a port in the range of
+ * start_port-end_port */
+static int sip_client_create_socket(struct sip_client *client,
+	struct sockaddr_storage *sockaddr, uint16_t start_port,
+	uint16_t end_port)
+{
+	int sockfd;
+	int ret;
+
+	sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+	if (sockfd < 0)
+		return sockfd;
+
+	memcpy(sockaddr, &client->local_addr, sizeof(client->local_addr));
+	do {
+		sockaddr_set_port(sockaddr, start_port);
+		ret = bind(sockfd, (struct sockaddr *)sockaddr, sizeof(*sockaddr));
+		++start_port;
+	} while (ret == -1 && start_port < end_port);
+
+	if (ret == -1)
+		return -1;
+
+	return sockfd;
+}
+
+static int sip_worker_thread(void *arg)
+{
+	struct sip_client *client = arg;
+
+    while (1) {
+		pj_time_val timeout = {0, 10};
+		pjsip_endpt_handle_events(client->sip_endpt, &timeout);
+    }
+
+    return 0;
+}
+
+static bool sip_agent_stream_recv_callback(int events, void *data)
+{
+	struct sip_agent *agent = data;
+	char buf[512];
+	int len;
+	int ret;
+
+	len = read(agent->stream->fd, buf, 512);
+	if (len < 0)
+		return true;
+
+	ret = sendto(agent->rtp_sockfd, buf, len, 0,
+		(struct sockaddr *)&agent->remote_addr, sizeof(agent->remote_addr));
+
+	if (ret < 0)
+		printf("failed to send rtp data: %d\n", errno);
+
+	return true;
+}
+
+
+static bool sip_agent_rtp_recv_callback(int events, void *data)
+{
+	struct sip_agent *agent = data;
+	char buf[512];
+	int len;
+
+	len = recvfrom(agent->rtp_sockfd, buf, 512, 0, NULL, NULL);
+	if (agent->stream)
+		write(agent->stream->fd, buf, len);
+
+	return true;
+}
+
+static pj_status_t sip_client_create_sdp(struct sip_client *client, pj_pool_t *pool,
+			       struct sip_agent *agent,
+			       pjmedia_sdp_session **p_sdp)
+{
+    pj_time_val tv;
+    pjmedia_sdp_session *sdp;
+    pjmedia_sdp_media *m;
+    pjmedia_sdp_attr *attr;
+	struct sockaddr_storage rtp_addr;
+	char addr[INET6_ADDRSTRLEN];
+
+    PJ_ASSERT_RETURN(pool && p_sdp, PJ_EINVAL);
+
+	agent->rtp_sockfd = sip_client_create_socket(client, &rtp_addr, 4000, 5000);
+	if (client->stun)
+		stun_client_resolve(client->stun, agent->rtp_sockfd,
+			(struct sockaddr *)&rtp_addr);
+
+	agent->rtp_recv_callback.callback = sip_agent_rtp_recv_callback;
+	agent->rtp_recv_callback.data = agent;
+	event_register(agent->rtp_sockfd, EPOLLIN, &agent->rtp_recv_callback);
+
+    /* Create and initialize basic SDP session */
+    sdp = pj_pool_zalloc (pool, sizeof(pjmedia_sdp_session));
+
+    pj_gettimeofday(&tv);
+    sdp->origin.user = pj_str("pjsip-siprtp");
+    sdp->origin.version = sdp->origin.id = tv.sec + 2208988800UL;
+    sdp->origin.net_type = pj_str("IN");
+    sdp->origin.addr_type = pj_str("IP4");
+    sdp->origin.addr = *pj_gethostname();
+    sdp->name = pj_str("pjsip");
+
+    /* Since we only support one media stream at present, put the
+     * SDP connection line in the session level.
+     */
+    sdp->conn = pj_pool_zalloc(pool, sizeof(pjmedia_sdp_conn));
+    sdp->conn->net_type = pj_str("IN");
+    sdp->conn->addr_type = pj_str("IP4");
+	sockaddr_to_string(&rtp_addr, addr, sizeof(addr));
+	pj_strdup2_with_null(pool, &sdp->conn->addr, addr);
+
+    /* SDP time and attributes. */
+    sdp->time.start = sdp->time.stop = 0;
+    sdp->attr_count = 0;
+
+    /* Create media stream 0: */
+
+    sdp->media_count = 1;
+    m = pj_pool_zalloc(pool, sizeof(pjmedia_sdp_media));
+    sdp->media[0] = m;
+
+    /* Standard media info: */
+    m->desc.media = pj_str("audio");
+    m->desc.port = sockaddr_get_port(&rtp_addr);
+    m->desc.port_count = 1;
+    m->desc.transport = pj_str("RTP/AVP");
+
+    /* Add format and rtpmap for each codec. */
+    m->desc.fmt_count = 1;
+    m->attr_count = 0;
+
+    {
+	pjmedia_sdp_rtpmap rtpmap;
+	char ptstr[10];
+
+	sprintf(ptstr, "%d", 0);
+	pj_strdup2_with_null(pool, &m->desc.fmt[0], ptstr);
+	rtpmap.pt = m->desc.fmt[0];
+	rtpmap.clock_rate = 64000;
+	rtpmap.enc_name = pj_str("PCMU");
+	rtpmap.param.slen = 0;
+
+    }
+
+    /* Add sendrecv attribute. */
+    attr = pj_pool_zalloc(pool, sizeof(pjmedia_sdp_attr));
+    attr->name = pj_str("sendrecv");
+    m->attr[m->attr_count++] = attr;
+
+    /* Done */
+    *p_sdp = sdp;
+
+    return PJ_SUCCESS;
+}
+
+static int sip_agent_invite(struct agent *agent, struct session *session)
+{
+	struct sip_agent *sip_agent = agent_to_sip_agent(agent);
+	struct sip_client *client = sip_agent->client;
+    pjsip_dialog *dlg;
+    pjmedia_sdp_session *sdp;
+    pjsip_tx_data *tdata;
+    pj_status_t status;
+	pj_str_t dst_uri;
+
+	sip_agent->session = session;
+
+	dst_uri = pj_str((char *)sip_agent->identifier);
+
+    /* Create UAC dialog */
+    status = pjsip_dlg_create_uac(pjsip_ua_instance(),
+				   &client->local_contact,	/* local URI	    */
+				   &client->local_contact,	/* local Contact    */
+				   &dst_uri,		/* remote URI    */
+				   &dst_uri,		/* remote target	    */
+				   &dlg);		/* dialog	    */
+    if (status != PJ_SUCCESS) {
+		fprintf(stderr, "Failed to create uac dialog\n");
+		return -1;
+	}
+
+	pjsip_auth_clt_set_credentials(&dlg->auth_sess, 1, &client->cred);
+
+    /* Create SDP */
+    sip_client_create_sdp(client, dlg->pool, sip_agent, &sdp);
+
+    /* Create the INVITE session. */
+    status = pjsip_inv_create_uac(dlg, sdp, 0, &sip_agent->inv);
+    if (status != PJ_SUCCESS) {
+		fprintf(stderr, "Failed to create invite session\n");
+		pjsip_dlg_terminate(dlg);
+		return -1;
+    }
+
+
+    /* Attach call data to invite session */
+    sip_agent->inv->mod_data[mod_siprtp.id] = sip_agent;
+
+    /* Create initial INVITE request.
+     * This INVITE request will contain a perfectly good request and
+     * an SDP body as well.
+     */
+    status = pjsip_inv_invite(sip_agent->inv, &tdata);
+    PJ_ASSERT_RETURN(status == PJ_SUCCESS, -1); /*TODO*/
+
+    /* Send initial INVITE request.
+     * From now on, the invite session's state will be reported to us
+     * via the invite session callbacks.
+     */
+    status = pjsip_inv_send_msg(sip_agent->inv, tdata);
+    PJ_ASSERT_RETURN(status == PJ_SUCCESS, -1); /*TODO*/
+
+    return 0;
+}
+
+static int sip_agent_hangup(struct agent *agent, struct session *session)
+{
+	struct sip_agent *sip_agent = agent_to_sip_agent(agent);
+    pjsip_tx_data *tdata;
+    pj_status_t status;
+
+	printf("hangup %p\n", sip_agent->inv);
+
+    status = pjsip_inv_end_session(sip_agent->inv, 603, NULL, &tdata);
+    if (status == PJ_SUCCESS && tdata != NULL)
+		pjsip_inv_send_msg(sip_agent->inv, tdata);
+
+	if (sip_agent->rtp_sockfd) {
+		event_unregister(sip_agent->rtp_sockfd);
+		close(sip_agent->rtp_sockfd);
+	}
+	if (sip_agent->stream) {
+		event_unregister(sip_agent->stream->fd);
+		tapi_stream_free(sip_agent->stream);
+	}
+
+	sip_agent->inv->mod_data[mod_siprtp.id] = NULL;
+	free(sip_agent);
+
+	return 0;
+}
+
+static int sip_agent_alloc_stream(struct sip_agent *agent)
+{
+	int flags;
+
+	if (agent->stream)
+		printf("BUG!!!! %s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	agent->stream = tapi_stream_alloc(agent->client->tdev);
+	agent->stream_recv_callback.callback = sip_agent_stream_recv_callback;
+	agent->stream_recv_callback.data = agent;
+
+	flags = fcntl(agent->stream->fd, F_GETFL, 0);
+	fcntl(agent->stream->fd, F_SETFL, flags | O_NONBLOCK);
+
+	event_register(agent->stream->fd, EPOLLIN, &agent->stream_recv_callback);
+
+	return 0;
+}
+
+static void sip_agent_free_stream(struct sip_agent *agent)
+{
+	if (!agent->stream)
+		return;
+
+	event_unregister(agent->stream->fd);
+	tapi_stream_free(agent->stream);
+	agent->stream = NULL;
+}
+
+static int sip_agent_accept(struct agent *agent, struct session *session)
+{
+	struct sip_agent *sip_agent = agent_to_sip_agent(agent);
+    pj_status_t status;
+	pjsip_tx_data *tdata;
+
+    /* Create 200 response .*/
+    status = pjsip_inv_answer(sip_agent->inv, 200,
+				      NULL, NULL, &tdata);
+    if (status != PJ_SUCCESS) {
+		status = pjsip_inv_answer(sip_agent->inv,
+					  PJSIP_SC_NOT_ACCEPTABLE,
+					  NULL, NULL, &tdata);
+		if (status == PJ_SUCCESS)
+			pjsip_inv_send_msg(sip_agent->inv, tdata);
+		else
+			pjsip_inv_terminate(sip_agent->inv, 500, PJ_FALSE);
+		return -1;
+    }
+
+    /* Send the 200 response. */
+    status = pjsip_inv_send_msg(sip_agent->inv, tdata);
+    PJ_ASSERT_ON_FAIL(status == PJ_SUCCESS, return -1);
+
+	sip_agent_alloc_stream(sip_agent);
+
+	return 0;
+}
+
+static int sip_agent_get_endpoint(struct agent *agent, struct session *session)
+{
+	struct sip_agent *sip_agent = agent_to_sip_agent(agent);
+	return tapi_stream_get_endpoint(sip_agent->stream);
+}
+
+static const struct agent_ops sip_agent_ops = {
+	.invite = sip_agent_invite,
+	.accept = sip_agent_accept,
+	.hangup = sip_agent_hangup,
+	.get_endpoint = sip_agent_get_endpoint,
+};
+
+struct sip_agent *sip_client_alloc_agent(struct sip_client *client,
+	const char *identifier)
+{
+	struct sip_agent *agent;
+
+	agent = malloc(sizeof(*agent));
+	memset(agent, 0, sizeof(*agent));
+
+	agent->agent.ops = &sip_agent_ops;
+	agent->identifier = identifier;
+	agent->client = client;
+
+	return agent;
+}
+
+/*
+ * Receive incoming call
+ */
+static void process_incoming_call(struct sip_client *client, pjsip_rx_data *rdata)
+{
+    unsigned options;
+	struct sip_agent *agent;
+    pjsip_tx_data *tdata;
+    pj_status_t status;
+    pjsip_dialog *dlg;
+    pjmedia_sdp_session *sdp;
+
+	agent = sip_client_alloc_agent(client, "extern");
+
+    /* Verify that we can handle the request. */
+    options = 0;
+    status = pjsip_inv_verify_request(rdata, &options, NULL, NULL,
+  				   client->sip_endpt, &tdata);
+    if (status != PJ_SUCCESS) {
+		/*
+		 * No we can't handle the incoming INVITE request.
+		 */
+		if (tdata) {
+			pjsip_response_addr res_addr;
+			pjsip_get_response_addr(tdata->pool, rdata, &res_addr);
+			pjsip_endpt_send_response(client->sip_endpt, &res_addr, tdata,
+			NULL, NULL);
+		} else {
+			/* Respond with 500 (Internal Server Error) */
+			pjsip_endpt_respond_stateless(client->sip_endpt, rdata, 500, NULL,
+			NULL, NULL);
+		}
+
+		return;
+    }
+
+    /* Create UAS dialog */
+    status = pjsip_dlg_create_uas(pjsip_ua_instance(), rdata,
+				   &client->local_contact, &dlg);
+    if (status != PJ_SUCCESS) {
+		const pj_str_t reason = pj_str("Unable to create dialog");
+		pjsip_endpt_respond_stateless(client->sip_endpt, rdata, 
+				       500, &reason,
+				       NULL, NULL);
+		return;
+    }
+
+    /* Create SDP */
+    sip_client_create_sdp(client, dlg->pool, agent, &sdp);
+
+    /* Create UAS invite session */
+    status = pjsip_inv_create_uas(dlg, rdata, sdp, 0, &agent->inv);
+    if (status != PJ_SUCCESS) {
+		pjsip_dlg_create_response(dlg, rdata, 500, NULL, &tdata);
+		pjsip_dlg_send_response(dlg, pjsip_rdata_get_tsx(rdata), tdata);
+		return;
+    }
+
+    /* Attach call data to invite session */
+    agent->inv->mod_data[mod_siprtp.id] = agent;
+
+    /* Create 180 response .*/
+    status = pjsip_inv_initial_answer(agent->inv, rdata, 180,
+				      NULL, NULL, &tdata);
+    if (status != PJ_SUCCESS) {
+		status = pjsip_inv_initial_answer(agent->inv, rdata,
+					  PJSIP_SC_NOT_ACCEPTABLE,
+					  NULL, NULL, &tdata);
+		if (status == PJ_SUCCESS)
+			pjsip_inv_send_msg(agent->inv, tdata);
+		else
+			pjsip_inv_terminate(agent->inv, 500, PJ_FALSE);
+		return;
+    }
+
+    /* Send the 180 response. */
+    status = pjsip_inv_send_msg(agent->inv, tdata);
+    PJ_ASSERT_ON_FAIL(status == PJ_SUCCESS, return);
+
+	if (client->incoming_call_cb)
+		client->incoming_call_cb(client, agent);
+}
+
+/* Callback to be called to handle incoming requests outside dialogs: */
+static pj_bool_t on_rx_request(pjsip_rx_data *rdata)
+{
+	struct sip_client *client = global_client;
+
+    /* Ignore strandled ACKs (must not send respone */
+    if (rdata->msg_info.msg->line.req.method.id == PJSIP_ACK_METHOD)
+		return PJ_FALSE;
+
+    /* Respond (statelessly) any non-INVITE requests with 500  */
+    if (rdata->msg_info.msg->line.req.method.id != PJSIP_INVITE_METHOD) {
+		pj_str_t reason = pj_str("Unsupported Operation");
+		pjsip_endpt_respond_stateless(client->sip_endpt, rdata,
+				       500, &reason,
+				       NULL, NULL);
+		return PJ_TRUE;
+    }
+
+    /* Handle incoming INVITE */
+    process_incoming_call(client, rdata);
+
+    /* Done */
+    return PJ_TRUE;
+}
+
+static pjsip_module sip_client_mod = {
+    NULL, NULL,			    /* prev, next.		*/
+    { "mod-tapisip", 13 },	    /* Name.			*/
+    -1,				    /* Id			*/
+    PJSIP_MOD_PRIORITY_APPLICATION, /* Priority			*/
+    NULL,			    /* load()			*/
+    NULL,			    /* start()			*/
+    NULL,			    /* stop()			*/
+    NULL,			    /* unload()			*/
+    &on_rx_request,		    /* on_rx_request()		*/
+    NULL,			    /* on_rx_response()		*/
+    NULL,			    /* on_tx_request.		*/
+    NULL,			    /* on_tx_response()		*/
+    NULL,			    /* on_tsx_state()		*/
+};
+
+/* Callback to be called when dialog has forked: */
+static void call_on_forked(pjsip_inv_session *inv, pjsip_event *e)
+{
+    PJ_UNUSED_ARG(inv);
+    PJ_UNUSED_ARG(e);
+}
+
+/* Callback to be called when invite session's state has changed: */
+static void call_on_state_changed(pjsip_inv_session *inv, pjsip_event *e)
+{
+    struct sip_agent *agent = inv->mod_data[mod_siprtp.id];
+
+	printf("state changed: %d\n", inv->state);
+
+    if (!agent)
+		return;
+
+	switch (inv->state) {
+    case PJSIP_INV_STATE_DISCONNECTED:
+		printf("Disconnected\n");
+		if (agent->session)
+			session_hangup(agent->session, &agent->agent);
+		if (agent->rtp_sockfd) {
+			event_unregister(agent->rtp_sockfd);
+			close(agent->rtp_sockfd);
+		}
+		sip_agent_free_stream(agent);
+		free(agent);
+		inv->mod_data[mod_siprtp.id] = NULL;
+		break;
+    case PJSIP_INV_STATE_CONFIRMED:
+		printf("Connected: %p\n", agent->stream);
+		if (agent->stream)
+			break;
+		sip_agent_alloc_stream(agent);
+		session_accept(agent->session, &agent->agent);
+		break;
+	default:
+		break;
+    }
+}
+
+static void call_on_media_update(pjsip_inv_session *inv, pj_status_t status)
+{
+    struct sip_agent *agent;
+    pj_pool_t *pool;
+    const pjmedia_sdp_session *local_sdp, *remote_sdp;
+	char local[100];
+	char remote[100];
+	int i;
+
+	printf("media updte\n");
+
+    agent = inv->mod_data[mod_siprtp.id];
+    pool = inv->dlg->pool;
+
+    /* Do nothing if media negotiation has failed */
+    if (status != PJ_SUCCESS)
+		return;
+    /* Capture stream definition from the SDP */
+    pjmedia_sdp_neg_get_active_local(inv->neg, &local_sdp);
+    pjmedia_sdp_neg_get_active_remote(inv->neg, &remote_sdp);
+
+	strlcpy(local, local_sdp->conn->addr.ptr, local_sdp->conn->addr.slen + 1);
+	printf("local media count: %d\n", local_sdp->media_count);
+	printf("local: %s %d\n", local,
+	ntohs(local_sdp->media[0]->desc.port));
+	strlcpy(remote, remote_sdp->conn->addr.ptr, remote_sdp->conn->addr.slen + 1);
+	printf("remote media count: %d\n", remote_sdp->media_count);
+	printf("remote: %s %d\n", remote,
+	ntohs(remote_sdp->media[0]->desc.port));
+
+	agent->remote_addr.ss_family = AF_INET;
+	inet_pton(AF_INET, remote,
+		sockaddr_get_addr(&agent->remote_addr));
+	sockaddr_set_port(&agent->remote_addr, remote_sdp->media[0]->desc.port);
+
+	printf("attributes: %d\n", remote_sdp->attr_count);
+	for (i = 0; i < remote_sdp->attr_count; ++i)
+		printf("%s: %s\n", remote_sdp->attr[i]->name.ptr,
+		remote_sdp->attr[i]->value.ptr);
+
+}
+
+static int sip_client_init_sip_endpoint(struct sip_client *client)
+{
+    pj_status_t status;
+	pjsip_host_port addrname;
+	pjsip_inv_callback inv_cb;
+	pjsip_transport *tp;
+	char public_addr[INET6_ADDRSTRLEN];
+
+	global_client = client;
+
+    pj_caching_pool_init(&client->cp, &pj_pool_factory_default_policy, 0);
+    client->pool = pj_pool_create(&client->cp.factory, "tapi sip", 1000, 1000, NULL);
+
+    status = pjsip_endpt_create(&client->cp.factory, NULL,
+				&client->sip_endpt);
+
+	client->sockfd = sip_client_create_socket(client, &client->public_addr, 5060, 5100);
+	if (client->stun)
+		stun_client_resolve(client->stun, client->sockfd, (struct sockaddr *)&client->public_addr);
+
+	sockaddr_to_string(&client->public_addr, public_addr, sizeof(public_addr));
+
+	addrname.host = pj_str(public_addr);
+	addrname.port = sockaddr_get_port(&client->public_addr);
+
+	pjsip_udp_transport_attach(client->sip_endpt, client->sockfd, &addrname, 1, &tp);
+
+    status = pjsip_tsx_layer_init_module(client->sip_endpt);
+    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
+
+    status = pjsip_ua_init_module(client->sip_endpt, NULL);
+    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
+
+    status = pjsip_100rel_init_module(client->sip_endpt);
+    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
+
+	pj_bzero(&inv_cb, sizeof(inv_cb));
+	inv_cb.on_state_changed = &call_on_state_changed;
+	inv_cb.on_new_session = &call_on_forked;
+	inv_cb.on_media_update = &call_on_media_update;
+
+	status = pjsip_inv_usage_init(client->sip_endpt, &inv_cb);
+	PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);
+
+    status = pjsip_endpt_register_module(client->sip_endpt, &sip_client_mod);
+
+	pj_thread_create(client->pool, "sip client", &sip_worker_thread, client,
+			  0, 0, &client->sip_thread);
+
+	return status;
+}
+
+static void sip_client_register_callback(struct pjsip_regc_cbparam *param)
+{
+	if (param->status != PJ_SUCCESS || param->code / 100 != 2)
+		printf("Failed to register: %d %d", param->status, param->code);
+}
+
+void sip_client_free(struct sip_client *client)
+{
+	pjsip_regc_destroy(client->regc);
+	pjsip_endpt_destroy(client->sip_endpt);
+}
+
+void sip_client_register(struct sip_client *client)
+{
+    pjsip_tx_data *tdata;
+
+	pjsip_regc_register(client->regc, true, &tdata);
+	pjsip_regc_send(client->regc, tdata);
+}
+
+void sip_client_set_cred(struct sip_client *client)
+{
+	char local_contact[100];
+	char server_uri[100];
+	char s[INET6_ADDRSTRLEN];
+	char contact_addr[INET6_ADDRSTRLEN + 10];
+	pj_str_t pj_contact_addr;
+
+	sockaddr_to_string(&client->public_addr, s, sizeof(s));
+
+	snprintf(contact_addr, sizeof(contact_addr), "sip:%s:%d", s,
+		sockaddr_get_port(&client->public_addr));
+	pj_contact_addr = pj_str(contact_addr);
+
+	client->cred.realm = pj_str((char *)client->config->host);
+	client->cred.scheme = pj_str("digest");
+	client->cred.username = pj_str((char *)client->config->username);
+	client->cred.data_type = PJSIP_CRED_DATA_PLAIN_PASSWD;
+	client->cred.data = pj_str((char *)client->config->password);
+
+	snprintf(local_contact, sizeof(local_contact), "sip:%s@%s",
+		client->config->username, client->config->host);
+    pj_strdup2_with_null(client->pool, &client->local_contact, local_contact);
+
+	snprintf(server_uri, sizeof(server_uri), "sip:%s\n", client->config->host);
+    pj_strdup2_with_null(client->pool, &client->server_uri, server_uri);
+
+	pjsip_regc_init(client->regc, &client->server_uri, &client->local_contact,
+		&client->local_contact, 1, &pj_contact_addr, 3600);
+	pjsip_regc_set_credentials(client->regc, 1, &client->cred);
+
+	sip_client_register(client);
+}
+
+void sip_client_init(struct sip_client *client, struct tapi_device *tdev,
+	const struct sip_client_config *config)
+{
+	global_client = client;
+	client->config = config;
+
+	client->tdev = tdev;
+
+	iface_get_addr(config->iface, &client->local_addr);
+
+	if (config->stun_host && config->stun_port)
+		client->stun = stun_client_alloc(config->stun_host, config->stun_port);
+	else
+		client->stun = NULL;
+
+	sip_client_init_sip_endpoint(client);
+
+	pjsip_regc_create(client->sip_endpt, client, sip_client_register_callback,
+		&client->regc);
+
+	sip_client_set_cred(client);
+}
+
+
diff --git a/package/tapi_sip/src/sip_client.h b/package/tapi_sip/src/sip_client.h
new file mode 100644
index 0000000..1c494b6
--- /dev/null
+++ b/package/tapi_sip/src/sip_client.h
@@ -0,0 +1,61 @@
+#ifndef __SIP_CLIENT_H__
+#define __SIP_CLIENT_H__
+
+#include <tapi-stream.h>
+#include <tapi-device.h>
+
+#include <pjsip.h>
+#include <pjsip_ua.h>
+#include <pjsip_simple.h>
+#include <pjlib-util.h>
+#include <pjlib.h>
+
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <stdint.h>
+
+struct stun_client;
+struct sip_agent;
+
+struct sip_client_config {
+	const char *iface;
+
+	const char *host;
+	uint16_t port;
+	const char *username;
+	const char *password;
+
+	const char *stun_host;
+	uint16_t stun_port;
+};
+
+struct sip_client {
+	const struct sip_client_config *config;
+
+	struct tapi_device *tdev;
+	struct stun_client *stun;
+
+	struct sockaddr_storage public_addr;
+	struct sockaddr_storage local_addr;
+
+	int sockfd;
+
+	pj_thread_t *sip_thread;
+    pj_caching_pool	 cp;
+    pj_pool_t		*pool;
+    pjsip_endpoint	*sip_endpt;
+	pjsip_cred_info cred;
+    pj_str_t		 local_contact;
+	pj_str_t		server_uri;
+
+	pjsip_regc *regc;
+
+	int (*incoming_call_cb)(struct sip_client *client, struct sip_agent *agent);
+};
+
+void sip_client_init(struct sip_client *client, struct tapi_device *dev,
+	const struct sip_client_config *config);
+
+struct sip_agent *sip_client_alloc_agent(struct sip_client *client, const char *dst_uri);
+
+#endif
diff --git a/package/tapi_sip/src/stun.c b/package/tapi_sip/src/stun.c
new file mode 100644
index 0000000..5c6b240
--- /dev/null
+++ b/package/tapi_sip/src/stun.c
@@ -0,0 +1,243 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+#include <poll.h>
+
+
+struct stun_client {
+	struct addrinfo *serverinfo;
+};
+
+struct stun_response {
+	struct sockaddr addr;
+};
+
+struct stun_header {
+	uint16_t type;
+	uint16_t length;
+	uint32_t cookie;
+	uint32_t id[3];
+} __attribute((packed));
+
+struct stun_packet {
+	struct stun_header header;
+	uint8_t data[0];
+} __attribute((packed));
+
+#define STUN_CLASS(c0, c1) (((c0) << 4) | ((c1) << 8))
+
+#define STUN_CLASS_REQUEST	STUN_CLASS(0, 0)
+#define STUN_CLASS_INDICATION	STUN_CLASS(0, 1)
+#define STUN_CLASS_SUCCESS	STUN_CLASS(1, 0)
+#define STUN_CLASS_ERROR	STUN_CLASS(1, 1)
+
+#define STUN_CLASS_MASK STUN_CLASS(1, 1)
+
+#define STUN_MESSAGE(msg) (((msg & 0xf10) << 2) | ((msg & 0x70) << 1) | (msg & 0xf))
+#define STUN_MESSAGE_BIND STUN_MESSAGE(1)
+
+#define STUN_COOKIE 0x2112a442
+
+enum {
+	STUN_ATTR_TYPE_MAPPED_ADDRESS = 0x1,
+	STUN_ATTR_TYPE_XOR_MAPPED_ADDRESS = 0x20,
+	STUN_ATTR_TYPE_XOR_MAPPED_ADDRESS2 = 0x8020,
+};
+
+static inline uint16_t get_unaligned_be16(const uint8_t *buf)
+{
+	return (buf[0] << 8) | buf[1];
+}
+
+static inline uint16_t get_unaligned_be32(const uint8_t *buf)
+{
+	return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
+}
+
+static int stun_parse_xor_mapped_address(struct stun_response *response,
+	const uint8_t *buf, int length)
+{
+	uint8_t fam = buf[1];
+	uint16_t port = get_unaligned_be16(&buf[2]);
+	struct sockaddr_in *sin = (struct sockaddr_in *)&response->addr;
+	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&response->addr;
+
+
+	switch (fam) {
+	case 0x1:
+		sin->sin_family = AF_INET;
+		sin->sin_port = htons((port ^ (uint16_t)((STUN_COOKIE & 0xffff0000) >> 16)));
+		memcpy(&sin->sin_addr.s_addr, buf + 4, 4);
+		sin->sin_addr.s_addr ^= htonl(STUN_COOKIE);
+		printf("xor port: %d\n", sin->sin_port);
+		break;
+	case 0x2:
+		sin6->sin6_family = AF_INET6;
+		sin->sin_port = htons((port ^ (uint16_t)((STUN_COOKIE & 0xffff0000) >> 16)));
+		memcpy(sin6->sin6_addr.s6_addr, buf + 4, 16);
+		break;
+	}
+
+	return 0;
+}
+
+static int stun_parse_mapped_address(struct stun_response *response,
+	const uint8_t *buf, int length)
+{
+	uint8_t fam = buf[1];
+	uint16_t port = get_unaligned_be16(&buf[2]);
+	struct sockaddr_in *sin = (struct sockaddr_in *)&response->addr;
+	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&response->addr;
+
+	printf("port: %d\n", port);
+
+	switch (fam) {
+	case 0x1:
+		sin->sin_family = AF_INET;
+		sin->sin_port = htons(port);
+		memcpy(&sin->sin_addr.s_addr, buf + 4, 4);
+		break;
+	case 0x2:
+		sin6->sin6_family = AF_INET6;
+		sin6->sin6_port = htons(port);
+		memcpy(sin6->sin6_addr.s6_addr, buf + 4, 16);
+		break;
+	}
+
+	return 0;
+}
+
+static int stun_parse_response(struct stun_response *response,
+	const struct stun_packet *packet)
+{
+	uint16_t attr_type, attr_length;
+	const uint8_t *buf;
+	int length = ntohs(packet->header.length);
+	int ret;
+	int i = 0;
+
+	if (packet->header.cookie != htonl(STUN_COOKIE))
+		return -1;
+
+	if (packet->header.length < 4)
+		return 0;
+
+	buf = packet->data;
+
+	do {
+		attr_type = get_unaligned_be16(&buf[i]);
+		attr_length = get_unaligned_be16(&buf[i + 2]);
+		i += 4;
+
+		if (i + attr_length > length)
+			break;
+
+		switch (attr_type) {
+		case STUN_ATTR_TYPE_MAPPED_ADDRESS:
+			ret = stun_parse_mapped_address(response, &buf[i], attr_length);
+			break;
+		case STUN_ATTR_TYPE_XOR_MAPPED_ADDRESS:
+		case STUN_ATTR_TYPE_XOR_MAPPED_ADDRESS2:
+			ret = stun_parse_xor_mapped_address(response, &buf[i], attr_length);
+			break;
+		}
+
+		i += attr_length;
+
+	} while (i < length && ret == 0);
+
+	return 0;
+}
+
+static struct stun_packet *stun_packet_alloc(size_t data_size)
+{
+	return malloc(sizeof(struct stun_packet) + data_size);
+}
+
+int stun_client_resolve(struct stun_client *stun, int sockfd, struct sockaddr *addr)
+{
+	struct stun_packet *packet = stun_packet_alloc(200);
+	struct stun_response response;
+	int ret;
+	int retries = 4;
+	int timeout = 500;
+	struct pollfd pollfd;
+
+	pollfd.events = POLLIN;
+	pollfd.fd = sockfd;
+
+	packet->header.type = htons(STUN_CLASS_REQUEST | STUN_MESSAGE_BIND);
+	packet->header.cookie = htonl(STUN_COOKIE);
+	packet->header.id[0] = 0x12345678;
+	packet->header.id[1] = 0x12345678;
+	packet->header.id[2] = 0x12345678;
+	packet->header.length = 0;
+
+	while (retries--) {
+		ret = sendto(sockfd, packet, sizeof(struct stun_header) + packet->header.length,
+			0, stun->serverinfo->ai_addr, stun->serverinfo->ai_addrlen);
+
+		ret = poll(&pollfd, 1, timeout);
+		switch (ret) {
+		case 0:
+			timeout <<= 1;
+		case -EINTR:
+			printf("retry\n");
+			continue;
+		default:
+			retries = 0;
+		}
+		ret = recvfrom(sockfd, packet, 200, 0, NULL, NULL);
+	}
+
+	if (ret <= 0)
+		return ret ? ret : -ETIMEDOUT;
+
+	memset(&response, 0, sizeof(response));
+	ret = stun_parse_response(&response, packet);
+
+	*addr = response.addr;
+
+	return ret;
+}
+
+struct stun_client *stun_client_alloc(const char *hostname, uint16_t port)
+{
+    struct addrinfo hints;
+	struct stun_client *stun;
+	int ret;
+	char p[6];
+
+
+	stun = malloc(sizeof(*stun));
+	if (!stun)
+		return NULL;
+
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_DGRAM;
+	hints.ai_flags = AI_NUMERICSERV;
+
+	snprintf(p, sizeof(p), "%d", port);
+    if ((ret = getaddrinfo(hostname, p, &hints, &stun->serverinfo)) != 0) {
+        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
+        return NULL;
+    }
+
+
+	return stun;
+}
+
+void stun_client_free(struct stun_client *stun)
+{
+	freeaddrinfo(stun->serverinfo);
+	free(stun);
+}
diff --git a/package/tapi_sip/src/stun.h b/package/tapi_sip/src/stun.h
new file mode 100644
index 0000000..2cd61c9
--- /dev/null
+++ b/package/tapi_sip/src/stun.h
@@ -0,0 +1,12 @@
+#ifndef __STUN_H__
+#define __STUN_H__
+
+#include <stdint.h>
+
+struct stun_client;
+
+struct stun_client *stun_client_alloc(const char *hostname, uint16_t port);
+void stun_client_free(struct stun_client *);
+int stun_client_resolve(struct stun_client *stun, int sockfd, struct sockaddr *addr);
+
+#endif
diff --git a/package/tapi_sip/src/tapi_agent.c b/package/tapi_sip/src/tapi_agent.c
new file mode 100644
index 0000000..93c73c2
--- /dev/null
+++ b/package/tapi_sip/src/tapi_agent.c
@@ -0,0 +1,105 @@
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <tapi-port.h>
+
+#include "session.h"
+#include "agent.h"
+#include "tapi_agent.h"
+
+static int tapi_agent_invite(struct agent *agent, struct session *session)
+{
+	struct tapi_agent *tagent = agent_to_tapi_agent(agent);
+
+	if (tagent->session)
+		return -1;
+
+	tagent->state = TAPI_AGENT_STATE_RINGING;
+	tapi_port_set_ring(&tagent->port, true);
+
+	tagent->session = session;
+
+	return 0;
+}
+
+static int tapi_agent_accept(struct agent *agent, struct session *session)
+{
+	return 0;
+}
+
+static int tapi_agent_hangup(struct agent *agent, struct session *session)
+{
+	struct tapi_agent *tagent = agent_to_tapi_agent(agent);
+
+	switch (tagent->state) {
+	case TAPI_AGENT_STATE_RINGING:
+		tapi_port_set_ring(&tagent->port, false);
+		break;
+	default:
+		break;
+	}
+
+	tagent->state = TAPI_AGENT_STATE_IDLE;
+	tagent->session = NULL;
+
+	return 0;
+}
+
+static int tapi_agent_get_endpoint(struct agent *agent, struct session *session)
+{
+	struct tapi_agent *tagent = agent_to_tapi_agent(agent);
+	return tapi_port_get_endpoint(&tagent->port);
+}
+
+static const struct agent_ops tapi_agent_ops = {
+	.invite = tapi_agent_invite,
+	.accept = tapi_agent_accept,
+	.hangup = tapi_agent_hangup,
+	.get_endpoint = tapi_agent_get_endpoint,
+};
+
+static void tapi_agent_event(struct tapi_port *port, struct tapi_event *event,
+	void *data)
+{
+	struct tapi_agent *tagent = data;
+
+	if (event->type != TAPI_EVENT_TYPE_HOOK)
+		return;
+
+	if (!tagent->session)
+		return;
+
+	if (event->hook.on) {
+		session_hangup(tagent->session, &tagent->agent);
+		tagent->state = TAPI_AGENT_STATE_IDLE;
+		tagent->session = NULL;
+	} else {
+		session_accept(tagent->session, &tagent->agent);
+		tagent->state = TAPI_AGENT_STATE_ACTIVE;
+	}
+}
+
+void tapi_agent_init(struct tapi_device *tdev, int port, struct tapi_agent *tagent)
+{
+	int ret;
+
+	tagent->agent.ops = &tapi_agent_ops;
+	tagent->state = TAPI_AGENT_STATE_IDLE;
+	tagent->session = NULL;
+
+	ret = tapi_port_open(tdev, port, &tagent->port);
+	if (ret) {
+		printf("Failed to open tapi port %d: %d\n", port, ret);
+		return;
+	}
+
+	tagent->event_listener.callback = tapi_agent_event;
+	tagent->event_listener.data = tagent;
+
+	tapi_port_register_event(&tagent->port, &tagent->event_listener);
+}
+
+void tapi_agent_free(struct tapi_agent *tagent)
+{
+	tapi_port_unregister_event(&tagent->port, &tagent->event_listener);
+}
diff --git a/package/tapi_sip/src/tapi_agent.h b/package/tapi_sip/src/tapi_agent.h
new file mode 100644
index 0000000..12e8701
--- /dev/null
+++ b/package/tapi_sip/src/tapi_agent.h
@@ -0,0 +1,37 @@
+#ifndef __TAPI_AGENT_H__
+#define __TAPI_AGENT_H__
+
+#include "agent.h"
+#include <tapi-port.h>
+
+struct session;
+
+enum tapi_agent_state {
+	TAPI_AGENT_STATE_IDLE,
+	TAPI_AGENT_STATE_RINGING,
+	TAPI_AGENT_STATE_ACTIVE,
+};
+
+struct tapi_agent {
+	struct agent agent;
+	struct tapi_port port;
+	struct tapi_port_event_listener event_listener;
+
+	enum tapi_agent_state state;
+
+	struct session *session;
+};
+
+static inline struct tapi_agent *agent_to_tapi_agent(struct agent *agent)
+{
+	return container_of(agent, struct tapi_agent, agent);
+}
+
+static inline struct tapi_agent *port_to_tapi_agent(struct tapi_port *port)
+{
+	return container_of(port, struct tapi_agent, port);
+}
+
+void tapi_agent_init(struct tapi_device *tdev, int port, struct tapi_agent *tagent);
+
+#endif
diff --git a/package/tapi_sip/src/tapi_sip.c b/package/tapi_sip/src/tapi_sip.c
new file mode 100644
index 0000000..518c63c
--- /dev/null
+++ b/package/tapi_sip/src/tapi_sip.c
@@ -0,0 +1,179 @@
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <poll.h>
+#include <string.h>
+
+#include <linux/input.h>
+#include "dialdetector.h"
+
+#include <tapi-ioctl.h>
+
+#include <tapi-device.h>
+#include <tapi-port.h>
+
+#include "contact.h"
+#include "session.h"
+#include "sip_client.h"
+#include "sip_agent.h"
+#include "tapi_agent.h"
+
+static struct tapi_device dev;
+static struct tapi_agent *ports;
+
+static struct sip_client sip_client;
+
+static void release_session(struct session *session)
+{
+	free(session);
+}
+
+static void dial(struct tapi_agent *caller, struct agent *callee)
+{
+	struct session *session;
+
+	session = session_alloc(&dev, &caller->agent, callee, release_session);
+
+	if (!session)
+		return;
+
+	caller->session = session;
+}
+
+static void tel_dial(struct tapi_agent *caller, const char *number)
+{
+	int callee;
+
+	callee = atoi(number) - 1;
+
+	if (callee < 0 || callee > 1)
+		return;
+	dial(caller, &ports[callee].agent);
+}
+
+static void sip_dial(struct tapi_agent *caller, const char *identifier)
+{
+	struct sip_agent *callee;
+
+	callee = sip_client_alloc_agent(&sip_client, identifier);
+	if (!callee)
+		return;
+
+	dial(caller, &callee->agent);
+}
+
+static void dial_callback(struct tapi_port *port, size_t num_digits, const unsigned char *digits)
+{
+	struct tapi_agent *tagent = port_to_tapi_agent(port);
+	char number[100];
+	struct contact *contact;
+	size_t i;
+
+	if (tagent->state != TAPI_AGENT_STATE_IDLE)
+		return;
+
+	for (i = 0; i < num_digits; ++i) {
+		if (digits[0] > 9)
+			break;
+		number[i] = digits[i] + '0';
+	}
+	number[i] = '\0';
+
+	printf("dial callback: %s\n", number);
+
+	contact = contact_get(number);
+
+	if (!contact)
+		return;
+
+	if (strncmp("tel:", contact->identifier, 4) == 0) {
+		tel_dial(tagent, contact->identifier + 4);
+	} else if (strncmp("sip:", contact->identifier, 4) == 0) {
+		sip_dial(tagent, contact->identifier);
+	}
+	tagent->state = TAPI_AGENT_STATE_ACTIVE;
+}
+
+static int incoming_sip_call(struct sip_client *client,
+	struct sip_agent *caller)
+{
+	struct tapi_agent *callee = NULL;;
+	struct session *session;
+	int i;
+
+	for (i = 0; i < 2; ++i) {
+		if (ports[i].state == TAPI_AGENT_STATE_IDLE) {
+			callee = &ports[i];
+			break;
+		}
+	}
+
+	if (callee == NULL)
+		return -1;
+
+	session = session_alloc(&dev, &caller->agent, &callee->agent,
+		release_session);
+	caller->session = session;
+
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	struct dialdetector *dd, *dd2;
+	struct account *account;
+	struct sip_client_config config;
+	const char *interface = "eth0";
+	int ret;
+	int i;
+
+	if (argc > 1)
+		interface = argv[1];
+
+	pj_init();
+    pjlib_util_init();
+
+	contacts_init();
+
+	account = get_account();
+	if (!account) {
+		printf("No account\n");
+		return 1;
+	}
+
+	ret = tapi_device_open(0, &dev);
+	if (ret) {
+		printf("Failed to open tapi device: %d\n", ret);
+		return 1;
+	}
+
+	ports = calloc(dev.num_ports, sizeof(*ports));
+	for (i = 0; i < dev.num_ports; ++i)
+		tapi_agent_init(&dev, i, &ports[i]);
+
+	dd = dialdetector_alloc(&ports[0].port);
+	dd->dial_callback = dial_callback;
+	dd2 = dialdetector_alloc(&ports[1].port);
+	dd2->dial_callback = dial_callback;
+
+	config.iface = interface;
+	config.host = account->realm;
+	config.port = account->sip_port;
+	config.username = account->username;
+	config.password = account->password;
+
+	config.stun_host = account->stun_host;
+	config.stun_port = account->stun_port;
+
+	sip_client_init(&sip_client, &dev, &config);
+
+	sip_client.incoming_call_cb = incoming_sip_call;
+
+	tapi_mainloop();
+
+	return 0;
+}