diff --git a/jni/pjproject-android/.svn/pristine/79/79c25c6e6c2b7962b0994737fe3403a269bafa71.svn-base b/jni/pjproject-android/.svn/pristine/79/79c25c6e6c2b7962b0994737fe3403a269bafa71.svn-base
new file mode 100644
index 0000000..42beb22
--- /dev/null
+++ b/jni/pjproject-android/.svn/pristine/79/79c25c6e6c2b7962b0994737fe3403a269bafa71.svn-base
@@ -0,0 +1,911 @@
+/* $Id$ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#include <pjnath/turn_sock.h>
+#include <pj/activesock.h>
+#include <pj/assert.h>
+#include <pj/errno.h>
+#include <pj/lock.h>
+#include <pj/log.h>
+#include <pj/pool.h>
+#include <pj/ioqueue.h>
+
+enum
+{
+    TIMER_NONE,
+    TIMER_DESTROY
+};
+
+
+enum { MAX_BIND_RETRY = 100 };
+
+
+#define INIT	0x1FFFFFFF
+
+struct pj_turn_sock
+{
+    pj_pool_t		*pool;
+    const char		*obj_name;
+    pj_turn_session	*sess;
+    pj_turn_sock_cb	 cb;
+    void		*user_data;
+
+    pj_bool_t		 is_destroying;
+    pj_grp_lock_t	*grp_lock;
+
+    pj_turn_alloc_param	 alloc_param;
+    pj_stun_config	 cfg;
+    pj_turn_sock_cfg	 setting;
+
+    pj_timer_entry	 timer;
+
+    int			 af;
+    pj_turn_tp_type	 conn_type;
+    pj_activesock_t	*active_sock;
+    pj_ioqueue_op_key_t	 send_key;
+};
+
+
+/*
+ * Callback prototypes.
+ */
+static pj_status_t turn_on_send_pkt(pj_turn_session *sess,
+				    const pj_uint8_t *pkt,
+				    unsigned pkt_len,
+				    const pj_sockaddr_t *dst_addr,
+				    unsigned dst_addr_len);
+static void turn_on_channel_bound(pj_turn_session *sess,
+				  const pj_sockaddr_t *peer_addr,
+				  unsigned addr_len,
+				  unsigned ch_num);
+static void turn_on_rx_data(pj_turn_session *sess,
+			    void *pkt,
+			    unsigned pkt_len,
+			    const pj_sockaddr_t *peer_addr,
+			    unsigned addr_len);
+static void turn_on_state(pj_turn_session *sess, 
+			  pj_turn_state_t old_state,
+			  pj_turn_state_t new_state);
+
+static pj_bool_t on_data_read(pj_activesock_t *asock,
+			      void *data,
+			      pj_size_t size,
+			      pj_status_t status,
+			      pj_size_t *remainder);
+static pj_bool_t on_connect_complete(pj_activesock_t *asock,
+				     pj_status_t status);
+
+
+
+static void turn_sock_on_destroy(void *comp);
+static void destroy(pj_turn_sock *turn_sock);
+static void timer_cb(pj_timer_heap_t *th, pj_timer_entry *e);
+
+
+/* Init config */
+PJ_DEF(void) pj_turn_sock_cfg_default(pj_turn_sock_cfg *cfg)
+{
+    pj_bzero(cfg, sizeof(*cfg));
+    cfg->max_pkt_size = PJ_TURN_MAX_PKT_LEN;
+    cfg->qos_type = PJ_QOS_TYPE_BEST_EFFORT;
+    cfg->qos_ignore_error = PJ_TRUE;
+}
+
+
+/*
+ * Create.
+ */
+PJ_DEF(pj_status_t) pj_turn_sock_create(pj_stun_config *cfg,
+					int af,
+					pj_turn_tp_type conn_type,
+					const pj_turn_sock_cb *cb,
+					const pj_turn_sock_cfg *setting,
+					void *user_data,
+					pj_turn_sock **p_turn_sock)
+{
+    pj_turn_sock *turn_sock;
+    pj_turn_session_cb sess_cb;
+    pj_turn_sock_cfg default_setting;
+    pj_pool_t *pool;
+    const char *name_tmpl;
+    pj_status_t status;
+
+    PJ_ASSERT_RETURN(cfg && p_turn_sock, PJ_EINVAL);
+    PJ_ASSERT_RETURN(af==pj_AF_INET() || af==pj_AF_INET6(), PJ_EINVAL);
+    PJ_ASSERT_RETURN(conn_type!=PJ_TURN_TP_TCP || PJ_HAS_TCP, PJ_EINVAL);
+
+    if (!setting) {
+	pj_turn_sock_cfg_default(&default_setting);
+	setting = &default_setting;
+    }
+
+    switch (conn_type) {
+    case PJ_TURN_TP_UDP:
+	name_tmpl = "udprel%p";
+	break;
+    case PJ_TURN_TP_TCP:
+	name_tmpl = "tcprel%p";
+	break;
+    default:
+	PJ_ASSERT_RETURN(!"Invalid TURN conn_type", PJ_EINVAL);
+	name_tmpl = "tcprel%p";
+	break;
+    }
+
+    /* Create and init basic data structure */
+    pool = pj_pool_create(cfg->pf, name_tmpl, PJNATH_POOL_LEN_TURN_SOCK,
+			  PJNATH_POOL_INC_TURN_SOCK, NULL);
+    turn_sock = PJ_POOL_ZALLOC_T(pool, pj_turn_sock);
+    turn_sock->pool = pool;
+    turn_sock->obj_name = pool->obj_name;
+    turn_sock->user_data = user_data;
+    turn_sock->af = af;
+    turn_sock->conn_type = conn_type;
+
+    /* Copy STUN config (this contains ioqueue, timer heap, etc.) */
+    pj_memcpy(&turn_sock->cfg, cfg, sizeof(*cfg));
+
+    /* Copy setting (QoS parameters etc */
+    pj_memcpy(&turn_sock->setting, setting, sizeof(*setting));
+
+    /* Set callback */
+    if (cb) {
+	pj_memcpy(&turn_sock->cb, cb, sizeof(*cb));
+    }
+
+    /* Session lock */
+    if (setting && setting->grp_lock) {
+	turn_sock->grp_lock = setting->grp_lock;
+    } else {
+	status = pj_grp_lock_create(pool, NULL, &turn_sock->grp_lock);
+	if (status != PJ_SUCCESS) {
+	    pj_pool_release(pool);
+	    return status;
+	}
+    }
+
+    pj_grp_lock_add_ref(turn_sock->grp_lock);
+    pj_grp_lock_add_handler(turn_sock->grp_lock, pool, turn_sock,
+                            &turn_sock_on_destroy);
+
+    /* Init timer */
+    pj_timer_entry_init(&turn_sock->timer, TIMER_NONE, turn_sock, &timer_cb);
+
+    /* Init TURN session */
+    pj_bzero(&sess_cb, sizeof(sess_cb));
+    sess_cb.on_send_pkt = &turn_on_send_pkt;
+    sess_cb.on_channel_bound = &turn_on_channel_bound;
+    sess_cb.on_rx_data = &turn_on_rx_data;
+    sess_cb.on_state = &turn_on_state;
+    status = pj_turn_session_create(cfg, pool->obj_name, af, conn_type,
+                                    turn_sock->grp_lock, &sess_cb, 0,
+                                    turn_sock, &turn_sock->sess);
+    if (status != PJ_SUCCESS) {
+	destroy(turn_sock);
+	return status;
+    }
+
+    /* Note: socket and ioqueue will be created later once the TURN server
+     * has been resolved.
+     */
+
+    *p_turn_sock = turn_sock;
+    return PJ_SUCCESS;
+}
+
+/*
+ * Destroy.
+ */
+static void turn_sock_on_destroy(void *comp)
+{
+    pj_turn_sock *turn_sock = (pj_turn_sock*) comp;
+
+    if (turn_sock->pool) {
+	pj_pool_t *pool = turn_sock->pool;
+	PJ_LOG(4,(turn_sock->obj_name, "TURN socket destroyed"));
+	turn_sock->pool = NULL;
+	pj_pool_release(pool);
+    }
+}
+
+static void destroy(pj_turn_sock *turn_sock)
+{
+    PJ_LOG(4,(turn_sock->obj_name, "TURN socket destroy request, ref_cnt=%d",
+	      pj_grp_lock_get_ref(turn_sock->grp_lock)));
+
+    pj_grp_lock_acquire(turn_sock->grp_lock);
+    if (turn_sock->is_destroying) {
+	pj_grp_lock_release(turn_sock->grp_lock);
+	return;
+    }
+
+    turn_sock->is_destroying = PJ_TRUE;
+    if (turn_sock->sess)
+	pj_turn_session_shutdown(turn_sock->sess);
+    if (turn_sock->active_sock)
+	pj_activesock_close(turn_sock->active_sock);
+    pj_grp_lock_dec_ref(turn_sock->grp_lock);
+    pj_grp_lock_release(turn_sock->grp_lock);
+}
+
+PJ_DEF(void) pj_turn_sock_destroy(pj_turn_sock *turn_sock)
+{
+    pj_grp_lock_acquire(turn_sock->grp_lock);
+    if (turn_sock->is_destroying) {
+	pj_grp_lock_release(turn_sock->grp_lock);
+	return;
+    }
+
+    if (turn_sock->sess) {
+	pj_turn_session_shutdown(turn_sock->sess);
+	/* This will ultimately call our state callback, and when
+	 * session state is DESTROYING we will schedule a timer to
+	 * destroy ourselves.
+	 */
+    } else {
+	destroy(turn_sock);
+    }
+
+    pj_grp_lock_release(turn_sock->grp_lock);
+}
+
+
+/* Timer callback */
+static void timer_cb(pj_timer_heap_t *th, pj_timer_entry *e)
+{
+    pj_turn_sock *turn_sock = (pj_turn_sock*)e->user_data;
+    int eid = e->id;
+
+    PJ_UNUSED_ARG(th);
+
+    e->id = TIMER_NONE;
+
+    switch (eid) {
+    case TIMER_DESTROY:
+	destroy(turn_sock);
+	break;
+    default:
+	pj_assert(!"Invalid timer id");
+	break;
+    }
+}
+
+
+/* Display error */
+static void show_err(pj_turn_sock *turn_sock, const char *title,
+		     pj_status_t status)
+{
+    PJ_PERROR(4,(turn_sock->obj_name, status, title));
+}
+
+/* On error, terminate session */
+static void sess_fail(pj_turn_sock *turn_sock, const char *title,
+		      pj_status_t status)
+{
+    show_err(turn_sock, title, status);
+    if (turn_sock->sess) {
+	pj_turn_session_destroy(turn_sock->sess, status);
+    }
+}
+
+/*
+ * Set user data.
+ */
+PJ_DEF(pj_status_t) pj_turn_sock_set_user_data( pj_turn_sock *turn_sock,
+					       void *user_data)
+{
+    PJ_ASSERT_RETURN(turn_sock, PJ_EINVAL);
+    turn_sock->user_data = user_data;
+    return PJ_SUCCESS;
+}
+
+/*
+ * Get user data.
+ */
+PJ_DEF(void*) pj_turn_sock_get_user_data(pj_turn_sock *turn_sock)
+{
+    PJ_ASSERT_RETURN(turn_sock, NULL);
+    return turn_sock->user_data;
+}
+
+/**
+ * Get info.
+ */
+PJ_DEF(pj_status_t) pj_turn_sock_get_info(pj_turn_sock *turn_sock,
+					  pj_turn_session_info *info)
+{
+    PJ_ASSERT_RETURN(turn_sock && info, PJ_EINVAL);
+
+    if (turn_sock->sess) {
+	return pj_turn_session_get_info(turn_sock->sess, info);
+    } else {
+	pj_bzero(info, sizeof(*info));
+	info->state = PJ_TURN_STATE_NULL;
+	return PJ_SUCCESS;
+    }
+}
+
+/**
+ * Lock the TURN socket. Application may need to call this function to
+ * synchronize access to other objects to avoid deadlock.
+ */
+PJ_DEF(pj_status_t) pj_turn_sock_lock(pj_turn_sock *turn_sock)
+{
+    return pj_grp_lock_acquire(turn_sock->grp_lock);
+}
+
+/**
+ * Unlock the TURN socket.
+ */
+PJ_DEF(pj_status_t) pj_turn_sock_unlock(pj_turn_sock *turn_sock)
+{
+    return pj_grp_lock_release(turn_sock->grp_lock);
+}
+
+/*
+ * Set STUN message logging for this TURN session. 
+ */
+PJ_DEF(void) pj_turn_sock_set_log( pj_turn_sock *turn_sock,
+				   unsigned flags)
+{
+    pj_turn_session_set_log(turn_sock->sess, flags);
+}
+
+/*
+ * Set software name
+ */
+PJ_DEF(pj_status_t) pj_turn_sock_set_software_name( pj_turn_sock *turn_sock,
+						    const pj_str_t *sw)
+{
+    return pj_turn_session_set_software_name(turn_sock->sess, sw);
+}
+
+/*
+ * Initialize.
+ */
+PJ_DEF(pj_status_t) pj_turn_sock_alloc(pj_turn_sock *turn_sock,
+				       const pj_str_t *domain,
+				       int default_port,
+				       pj_dns_resolver *resolver,
+				       const pj_stun_auth_cred *cred,
+				       const pj_turn_alloc_param *param)
+{
+    pj_status_t status;
+
+    PJ_ASSERT_RETURN(turn_sock && domain, PJ_EINVAL);
+    PJ_ASSERT_RETURN(turn_sock->sess, PJ_EINVALIDOP);
+
+    pj_grp_lock_acquire(turn_sock->grp_lock);
+
+    /* Copy alloc param. We will call session_alloc() only after the 
+     * server address has been resolved.
+     */
+    if (param) {
+	pj_turn_alloc_param_copy(turn_sock->pool, &turn_sock->alloc_param, param);
+    } else {
+	pj_turn_alloc_param_default(&turn_sock->alloc_param);
+    }
+
+    /* Set credental */
+    if (cred) {
+	status = pj_turn_session_set_credential(turn_sock->sess, cred);
+	if (status != PJ_SUCCESS) {
+	    sess_fail(turn_sock, "Error setting credential", status);
+	    pj_grp_lock_release(turn_sock->grp_lock);
+	    return status;
+	}
+    }
+
+    /* Resolve server */
+    status = pj_turn_session_set_server(turn_sock->sess, domain, default_port,
+					resolver);
+    if (status != PJ_SUCCESS) {
+	sess_fail(turn_sock, "Error setting TURN server", status);
+	pj_grp_lock_release(turn_sock->grp_lock);
+	return status;
+    }
+
+    /* Done for now. The next work will be done when session state moved
+     * to RESOLVED state.
+     */
+    pj_grp_lock_release(turn_sock->grp_lock);
+    return PJ_SUCCESS;
+}
+
+/*
+ * Install permission
+ */
+PJ_DEF(pj_status_t) pj_turn_sock_set_perm( pj_turn_sock *turn_sock,
+					   unsigned addr_cnt,
+					   const pj_sockaddr addr[],
+					   unsigned options)
+{
+    if (turn_sock->sess == NULL)
+	return PJ_EINVALIDOP;
+
+    return pj_turn_session_set_perm(turn_sock->sess, addr_cnt, addr, options);
+}
+
+/*
+ * Send packet.
+ */ 
+PJ_DEF(pj_status_t) pj_turn_sock_sendto( pj_turn_sock *turn_sock,
+					const pj_uint8_t *pkt,
+					unsigned pkt_len,
+					const pj_sockaddr_t *addr,
+					unsigned addr_len)
+{
+    PJ_ASSERT_RETURN(turn_sock && addr && addr_len, PJ_EINVAL);
+
+    if (turn_sock->sess == NULL)
+	return PJ_EINVALIDOP;
+
+    return pj_turn_session_sendto(turn_sock->sess, pkt, pkt_len, 
+				  addr, addr_len);
+}
+
+/*
+ * Bind a peer address to a channel number.
+ */
+PJ_DEF(pj_status_t) pj_turn_sock_bind_channel( pj_turn_sock *turn_sock,
+					      const pj_sockaddr_t *peer,
+					      unsigned addr_len)
+{
+    PJ_ASSERT_RETURN(turn_sock && peer && addr_len, PJ_EINVAL);
+    PJ_ASSERT_RETURN(turn_sock->sess != NULL, PJ_EINVALIDOP);
+
+    return pj_turn_session_bind_channel(turn_sock->sess, peer, addr_len);
+}
+
+
+/*
+ * Notification when outgoing TCP socket has been connected.
+ */
+static pj_bool_t on_connect_complete(pj_activesock_t *asock,
+				     pj_status_t status)
+{
+    pj_turn_sock *turn_sock;
+
+    turn_sock = (pj_turn_sock*) pj_activesock_get_user_data(asock);
+    if (!turn_sock)
+        return PJ_FALSE;
+
+    pj_grp_lock_acquire(turn_sock->grp_lock);
+
+    /* TURN session may have already been destroyed here.
+     * See ticket #1557 (http://trac.pjsip.org/repos/ticket/1557).
+     */
+    if (!turn_sock->sess) {
+	sess_fail(turn_sock, "TURN session already destroyed", status);
+	pj_grp_lock_release(turn_sock->grp_lock);
+	return PJ_FALSE;
+    }
+
+    if (status != PJ_SUCCESS) {
+	sess_fail(turn_sock, "TCP connect() error", status);
+	pj_grp_lock_release(turn_sock->grp_lock);
+	return PJ_FALSE;
+    }
+
+    if (turn_sock->conn_type != PJ_TURN_TP_UDP) {
+	PJ_LOG(5,(turn_sock->obj_name, "TCP connected"));
+    }
+
+    /* Kick start pending read operation */
+    status = pj_activesock_start_read(asock, turn_sock->pool, 
+				      turn_sock->setting.max_pkt_size, 0);
+
+    /* Init send_key */
+    pj_ioqueue_op_key_init(&turn_sock->send_key, sizeof(turn_sock->send_key));
+
+    /* Send Allocate request */
+    status = pj_turn_session_alloc(turn_sock->sess, &turn_sock->alloc_param);
+    if (status != PJ_SUCCESS) {
+	sess_fail(turn_sock, "Error sending ALLOCATE", status);
+	pj_grp_lock_release(turn_sock->grp_lock);
+	return PJ_FALSE;
+    }
+
+    pj_grp_lock_release(turn_sock->grp_lock);
+    return PJ_TRUE;
+}
+
+static pj_uint16_t GETVAL16H(const pj_uint8_t *buf, unsigned pos)
+{
+    return (pj_uint16_t) ((buf[pos + 0] << 8) | \
+			  (buf[pos + 1] << 0));
+}
+
+/* Quick check to determine if there is enough packet to process in the
+ * incoming buffer. Return the packet length, or zero if there's no packet.
+ */
+static unsigned has_packet(pj_turn_sock *turn_sock, const void *buf, pj_size_t bufsize)
+{
+    pj_bool_t is_stun;
+
+    if (turn_sock->conn_type == PJ_TURN_TP_UDP)
+	return (unsigned)bufsize;
+
+    /* Quickly check if this is STUN message, by checking the first two bits and
+     * size field which must be multiple of 4 bytes
+     */
+    is_stun = ((((pj_uint8_t*)buf)[0] & 0xC0) == 0) &&
+	      ((GETVAL16H((const pj_uint8_t*)buf, 2) & 0x03)==0);
+
+    if (is_stun) {
+	pj_size_t msg_len = GETVAL16H((const pj_uint8_t*)buf, 2);
+	return (unsigned)((msg_len+20 <= bufsize) ? msg_len+20 : 0);
+    } else {
+	/* This must be ChannelData. */
+	pj_turn_channel_data cd;
+
+	if (bufsize < 4)
+	    return 0;
+
+	/* Decode ChannelData packet */
+	pj_memcpy(&cd, buf, sizeof(pj_turn_channel_data));
+	cd.length = pj_ntohs(cd.length);
+
+	if (bufsize >= cd.length+sizeof(cd)) 
+	    return (cd.length+sizeof(cd)+3) & (~3);
+	else
+	    return 0;
+    }
+}
+
+/*
+ * Notification from ioqueue when incoming UDP packet is received.
+ */
+static pj_bool_t on_data_read(pj_activesock_t *asock,
+			      void *data,
+			      pj_size_t size,
+			      pj_status_t status,
+			      pj_size_t *remainder)
+{
+    pj_turn_sock *turn_sock;
+    pj_bool_t ret = PJ_TRUE;
+
+    turn_sock = (pj_turn_sock*) pj_activesock_get_user_data(asock);
+    pj_grp_lock_acquire(turn_sock->grp_lock);
+
+    if (status == PJ_SUCCESS && turn_sock->sess && !turn_sock->is_destroying) {
+	/* Report incoming packet to TURN session, repeat while we have
+	 * "packet" in the buffer (required for stream-oriented transports)
+	 */
+	unsigned pkt_len;
+
+	//PJ_LOG(5,(turn_sock->pool->obj_name, 
+	//	  "Incoming data, %lu bytes total buffer", size));
+
+	while ((pkt_len=has_packet(turn_sock, data, size)) != 0) {
+	    pj_size_t parsed_len;
+	    //const pj_uint8_t *pkt = (const pj_uint8_t*)data;
+
+	    //PJ_LOG(5,(turn_sock->pool->obj_name, 
+	    //	      "Packet start: %02X %02X %02X %02X", 
+	    //	      pkt[0], pkt[1], pkt[2], pkt[3]));
+
+	    //PJ_LOG(5,(turn_sock->pool->obj_name, 
+	    //	      "Processing %lu bytes packet of %lu bytes total buffer",
+	    //	      pkt_len, size));
+
+	    parsed_len = (unsigned)size;
+	    pj_turn_session_on_rx_pkt(turn_sock->sess, data,  size, &parsed_len);
+
+	    /* parsed_len may be zero if we have parsing error, so use our
+	     * previous calculation to exhaust the bad packet.
+	     */
+	    if (parsed_len == 0)
+		parsed_len = pkt_len;
+
+	    if (parsed_len < (unsigned)size) {
+		*remainder = size - parsed_len;
+		pj_memmove(data, ((char*)data)+parsed_len, *remainder);
+	    } else {
+		*remainder = 0;
+	    }
+	    size = *remainder;
+
+	    //PJ_LOG(5,(turn_sock->pool->obj_name, 
+	    //	      "Buffer size now %lu bytes", size));
+	}
+    } else if (status != PJ_SUCCESS && 
+	       turn_sock->conn_type != PJ_TURN_TP_UDP) 
+    {
+	sess_fail(turn_sock, "TCP connection closed", status);
+	ret = PJ_FALSE;
+	goto on_return;
+    }
+
+on_return:
+    pj_grp_lock_release(turn_sock->grp_lock);
+
+    return ret;
+}
+
+
+/*
+ * Callback from TURN session to send outgoing packet.
+ */
+static pj_status_t turn_on_send_pkt(pj_turn_session *sess,
+				    const pj_uint8_t *pkt,
+				    unsigned pkt_len,
+				    const pj_sockaddr_t *dst_addr,
+				    unsigned dst_addr_len)
+{
+    pj_turn_sock *turn_sock = (pj_turn_sock*) 
+			      pj_turn_session_get_user_data(sess);
+    pj_ssize_t len = pkt_len;
+    pj_status_t status;
+
+    if (turn_sock == NULL || turn_sock->is_destroying) {
+	/* We've been destroyed */
+	// https://trac.pjsip.org/repos/ticket/1316
+	//pj_assert(!"We should shutdown gracefully");
+	return PJ_EINVALIDOP;
+    }
+
+    PJ_UNUSED_ARG(dst_addr);
+    PJ_UNUSED_ARG(dst_addr_len);
+
+    status = pj_activesock_send(turn_sock->active_sock, &turn_sock->send_key,
+				pkt, &len, 0);
+    if (status != PJ_SUCCESS && status != PJ_EPENDING) {
+	show_err(turn_sock, "socket send()", status);
+    }
+
+    return status;
+}
+
+
+/*
+ * Callback from TURN session when a channel is successfully bound.
+ */
+static void turn_on_channel_bound(pj_turn_session *sess,
+				  const pj_sockaddr_t *peer_addr,
+				  unsigned addr_len,
+				  unsigned ch_num)
+{
+    PJ_UNUSED_ARG(sess);
+    PJ_UNUSED_ARG(peer_addr);
+    PJ_UNUSED_ARG(addr_len);
+    PJ_UNUSED_ARG(ch_num);
+}
+
+
+/*
+ * Callback from TURN session upon incoming data.
+ */
+static void turn_on_rx_data(pj_turn_session *sess,
+			    void *pkt,
+			    unsigned pkt_len,
+			    const pj_sockaddr_t *peer_addr,
+			    unsigned addr_len)
+{
+    pj_turn_sock *turn_sock = (pj_turn_sock*) 
+			   pj_turn_session_get_user_data(sess);
+    if (turn_sock == NULL || turn_sock->is_destroying) {
+	/* We've been destroyed */
+	return;
+    }
+
+    if (turn_sock->cb.on_rx_data) {
+	(*turn_sock->cb.on_rx_data)(turn_sock, pkt, pkt_len, 
+				  peer_addr, addr_len);
+    }
+}
+
+
+/*
+ * Callback from TURN session when state has changed
+ */
+static void turn_on_state(pj_turn_session *sess, 
+			  pj_turn_state_t old_state,
+			  pj_turn_state_t new_state)
+{
+    pj_turn_sock *turn_sock = (pj_turn_sock*) 
+			   pj_turn_session_get_user_data(sess);
+    pj_status_t status;
+
+    if (turn_sock == NULL) {
+	/* We've been destroyed */
+	return;
+    }
+
+    /* Notify app first */
+    if (turn_sock->cb.on_state) {
+	(*turn_sock->cb.on_state)(turn_sock, old_state, new_state);
+    }
+
+    /* Make sure user hasn't destroyed us in the callback */
+    if (turn_sock->sess && new_state == PJ_TURN_STATE_RESOLVED) {
+	pj_turn_session_info info;
+	pj_turn_session_get_info(turn_sock->sess, &info);
+	new_state = info.state;
+    }
+
+    if (turn_sock->sess && new_state == PJ_TURN_STATE_RESOLVED) {
+	/*
+	 * Once server has been resolved, initiate outgoing TCP
+	 * connection to the server.
+	 */
+	pj_turn_session_info info;
+	char addrtxt[PJ_INET6_ADDRSTRLEN+8];
+	int sock_type;
+	pj_sock_t sock;
+	pj_activesock_cfg asock_cfg;
+	pj_activesock_cb asock_cb;
+	pj_sockaddr bound_addr, *cfg_bind_addr;
+	pj_uint16_t max_bind_retry;
+
+	/* Close existing connection, if any. This happens when
+	 * we're switching to alternate TURN server when either TCP
+	 * connection or ALLOCATE request failed.
+	 */
+	if (turn_sock->active_sock) {
+	    pj_activesock_close(turn_sock->active_sock);
+	    turn_sock->active_sock = NULL;
+	}
+
+	/* Get server address from session info */
+	pj_turn_session_get_info(sess, &info);
+
+	if (turn_sock->conn_type == PJ_TURN_TP_UDP)
+	    sock_type = pj_SOCK_DGRAM();
+	else
+	    sock_type = pj_SOCK_STREAM();
+
+	/* Init socket */
+	status = pj_sock_socket(turn_sock->af, sock_type, 0, &sock);
+	if (status != PJ_SUCCESS) {
+	    pj_turn_sock_destroy(turn_sock);
+	    return;
+	}
+
+	/* Bind socket */
+	cfg_bind_addr = &turn_sock->setting.bound_addr;
+	max_bind_retry = MAX_BIND_RETRY;
+	if (turn_sock->setting.port_range &&
+	    turn_sock->setting.port_range < max_bind_retry)
+	{
+	    max_bind_retry = turn_sock->setting.port_range;
+	}
+	pj_sockaddr_init(turn_sock->af, &bound_addr, NULL, 0);
+	if (cfg_bind_addr->addr.sa_family == pj_AF_INET() || 
+	    cfg_bind_addr->addr.sa_family == pj_AF_INET6())
+	{
+	    pj_sockaddr_cp(&bound_addr, cfg_bind_addr);
+	}
+	status = pj_sock_bind_random(sock, &bound_addr,
+				     turn_sock->setting.port_range,
+				     max_bind_retry);
+	if (status != PJ_SUCCESS) {
+	    pj_turn_sock_destroy(turn_sock);
+	    return;
+	}
+
+	/* Apply QoS, if specified */
+	status = pj_sock_apply_qos2(sock, turn_sock->setting.qos_type,
+				    &turn_sock->setting.qos_params, 
+				    (turn_sock->setting.qos_ignore_error?2:1),
+				    turn_sock->pool->obj_name, NULL);
+	if (status != PJ_SUCCESS && !turn_sock->setting.qos_ignore_error) {
+	    pj_turn_sock_destroy(turn_sock);
+	    return;
+	}
+
+	/* Apply socket buffer size */
+	if (turn_sock->setting.so_rcvbuf_size > 0) {
+	    unsigned sobuf_size = turn_sock->setting.so_rcvbuf_size;
+	    status = pj_sock_setsockopt_sobuf(sock, pj_SO_RCVBUF(),
+					      PJ_TRUE, &sobuf_size);
+	    if (status != PJ_SUCCESS) {
+		pj_perror(3, turn_sock->obj_name, status,
+			  "Failed setting SO_RCVBUF");
+	    } else {
+		if (sobuf_size < turn_sock->setting.so_rcvbuf_size) {
+		    PJ_LOG(4, (turn_sock->obj_name, 
+			       "Warning! Cannot set SO_RCVBUF as configured,"
+			       " now=%d, configured=%d", sobuf_size,
+			       turn_sock->setting.so_rcvbuf_size));
+		} else {
+		    PJ_LOG(5, (turn_sock->obj_name, "SO_RCVBUF set to %d",
+			       sobuf_size));
+		}
+	    }
+	}
+	if (turn_sock->setting.so_sndbuf_size > 0) {
+	    unsigned sobuf_size = turn_sock->setting.so_sndbuf_size;
+	    status = pj_sock_setsockopt_sobuf(sock, pj_SO_SNDBUF(),
+					      PJ_TRUE, &sobuf_size);
+	    if (status != PJ_SUCCESS) {
+		pj_perror(3, turn_sock->obj_name, status,
+			  "Failed setting SO_SNDBUF");
+	    } else {
+		if (sobuf_size < turn_sock->setting.so_sndbuf_size) {
+		    PJ_LOG(4, (turn_sock->obj_name, 
+			       "Warning! Cannot set SO_SNDBUF as configured,"
+			       " now=%d, configured=%d", sobuf_size,
+			       turn_sock->setting.so_sndbuf_size));
+		} else {
+		    PJ_LOG(5, (turn_sock->obj_name, "SO_SNDBUF set to %d",
+			       sobuf_size));
+		}
+	    }
+	}
+
+	/* Create active socket */
+	pj_activesock_cfg_default(&asock_cfg);
+	asock_cfg.grp_lock = turn_sock->grp_lock;
+
+	pj_bzero(&asock_cb, sizeof(asock_cb));
+	asock_cb.on_data_read = &on_data_read;
+	asock_cb.on_connect_complete = &on_connect_complete;
+	status = pj_activesock_create(turn_sock->pool, sock,
+				      sock_type, &asock_cfg,
+				      turn_sock->cfg.ioqueue, &asock_cb, 
+				      turn_sock,
+				      &turn_sock->active_sock);
+	if (status != PJ_SUCCESS) {
+	    pj_turn_sock_destroy(turn_sock);
+	    return;
+	}
+
+	PJ_LOG(5,(turn_sock->pool->obj_name,
+		  "Connecting to %s", 
+		  pj_sockaddr_print(&info.server, addrtxt, 
+				    sizeof(addrtxt), 3)));
+
+	/* Initiate non-blocking connect */
+#if PJ_HAS_TCP
+	status=pj_activesock_start_connect(turn_sock->active_sock, 
+					   turn_sock->pool,
+					   &info.server, 
+					   pj_sockaddr_get_len(&info.server));
+	if (status == PJ_SUCCESS) {
+	    on_connect_complete(turn_sock->active_sock, PJ_SUCCESS);
+	} else if (status != PJ_EPENDING) {
+	    pj_turn_sock_destroy(turn_sock);
+	    return;
+	}
+#else
+	on_connect_complete(turn_sock->active_sock, PJ_SUCCESS);
+#endif
+
+	/* Done for now. Subsequent work will be done in 
+	 * on_connect_complete() callback.
+	 */
+    }
+
+    if (new_state >= PJ_TURN_STATE_DESTROYING && turn_sock->sess) {
+	pj_time_val delay = {0, 0};
+
+	turn_sock->sess = NULL;
+	pj_turn_session_set_user_data(sess, NULL);
+
+	pj_timer_heap_cancel_if_active(turn_sock->cfg.timer_heap,
+	                               &turn_sock->timer, 0);
+	pj_timer_heap_schedule_w_grp_lock(turn_sock->cfg.timer_heap,
+	                                  &turn_sock->timer,
+	                                  &delay, TIMER_DESTROY,
+	                                  turn_sock->grp_lock);
+    }
+}
+
+