diff --git a/trunk/src/app/srs_app_listener.cpp b/trunk/src/app/srs_app_listener.cpp
index 667dd5036..00a9d7560 100755
--- a/trunk/src/app/srs_app_listener.cpp
+++ b/trunk/src/app/srs_app_listener.cpp
@@ -237,23 +237,21 @@ SrsUdpMuxSocket::~SrsUdpMuxSocket()
     srs_freepa(buf);
 }
 
-SrsUdpMuxSocket::SrsUdpMuxSocket(const SrsUdpMuxSocket& rhs)
+SrsUdpMuxSocket* SrsUdpMuxSocket::copy_sendonly()
 {
-    operator=(rhs);
-}
+    SrsUdpMuxSocket* sendonly = new SrsUdpMuxSocket(lfd);
 
-SrsUdpMuxSocket& SrsUdpMuxSocket::operator=(const SrsUdpMuxSocket& rhs)
-{
-    buf = NULL;
-    nb_buf = 0;
-    nread = 0;
-    lfd = rhs.lfd;
-    from = rhs.from;
-    fromlen = rhs.fromlen;
-    peer_ip = rhs.peer_ip;
-    peer_port = rhs.peer_port;
+    // Don't copy buffer
+    srs_freepa(sendonly->buf);
+    sendonly->nb_buf    = 0;
+    sendonly->nread     = 0;
+    sendonly->lfd       = lfd;
+    sendonly->from      = from;
+    sendonly->fromlen   = fromlen;
+    sendonly->peer_ip   = peer_ip;
+    sendonly->peer_port = peer_port;
 
-    return *this;
+    return sendonly;
 }
 
 int SrsUdpMuxSocket::recvfrom(srs_utime_t timeout)
diff --git a/trunk/src/app/srs_app_listener.hpp b/trunk/src/app/srs_app_listener.hpp
index 1a73b6faf..75aea4c52 100644
--- a/trunk/src/app/srs_app_listener.hpp
+++ b/trunk/src/app/srs_app_listener.hpp
@@ -143,9 +143,6 @@ public:
     SrsUdpMuxSocket(srs_netfd_t fd);
     virtual ~SrsUdpMuxSocket();
 
-    SrsUdpMuxSocket(const SrsUdpMuxSocket& rhs);
-    SrsUdpMuxSocket& operator=(const SrsUdpMuxSocket& rhs);
-
     int recvfrom(srs_utime_t timeout);
     srs_error_t sendto(void* data, int size, srs_utime_t timeout);
 
@@ -154,6 +151,12 @@ public:
     std::string get_peer_ip() const { return peer_ip; }
     int get_peer_port() const { return peer_port; }
     std::string get_peer_id();
+public:
+    SrsUdpMuxSocket* copy_sendonly();
+private:
+    // Don't allow copy, user copy_sendonly instead
+    SrsUdpMuxSocket(const SrsUdpMuxSocket& rhs);
+    SrsUdpMuxSocket& operator=(const SrsUdpMuxSocket& rhs);
 };
 
 class SrsUdpMuxListener : public ISrsCoroutineHandler
diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index 77de89bd6..da08a5cf3 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -605,18 +605,19 @@ srs_error_t SrsDtlsSession::unprotect_rtcp(char* out_buf, const char* in_buf, in
 }
 
 SrsRtcSenderThread::SrsRtcSenderThread(SrsRtcSession* s, SrsUdpMuxSocket* u, int parent_cid)
-    : ukt(NULL)
+    : sendonly_ukt(NULL)
 {
     _parent_cid = parent_cid;
     trd = new SrsDummyCoroutine();
 
     rtc_session = s;
-    ukt = *u;
+    sendonly_ukt = u->copy_sendonly();
 }
 
 SrsRtcSenderThread::~SrsRtcSenderThread()
 {
     srs_freep(trd);
+    srs_freep(sendonly_ukt);
 }
 
 int SrsRtcSenderThread::cid()
@@ -695,10 +696,19 @@ srs_error_t SrsRtcSenderThread::cycle()
             continue;
         }
 
-        send_and_free_messages(msgs.msgs, msg_count, &ukt);
+        send_and_free_messages(msgs.msgs, msg_count, sendonly_ukt);
     }
 }
 
+void SrsRtcSenderThread::update_sendonly_socket(SrsUdpMuxSocket* ukt) 
+{
+    srs_trace("session %s address changed, update %s -> %s", 
+        rtc_session->id().c_str(), sendonly_ukt->get_peer_id().c_str(), ukt->get_peer_id().c_str());
+
+    srs_freep(sendonly_ukt);
+    sendonly_ukt = ukt->copy_sendonly();
+}
+
 void SrsRtcSenderThread::send_and_free_messages(SrsSharedPtrMessage** msgs, int nb_msgs, SrsUdpMuxSocket* udp_mux_skt)
 {
     srs_error_t err = srs_success;
@@ -776,6 +786,12 @@ srs_error_t SrsRtcSession::on_stun(SrsUdpMuxSocket* udp_mux_skt, SrsStunPacket*
 
     last_stun_time = srs_get_system_time();
 
+    if (strd && strd->sendonly_ukt) {
+        if (strd->sendonly_ukt->get_peer_id() != udp_mux_skt->get_peer_id()) {
+            strd->update_sendonly_socket(udp_mux_skt);
+        }
+    }
+
     return err;
 }
 
diff --git a/trunk/src/app/srs_app_rtc_conn.hpp b/trunk/src/app/srs_app_rtc_conn.hpp
index 029c8d4ab..aaf0cbe62 100644
--- a/trunk/src/app/srs_app_rtc_conn.hpp
+++ b/trunk/src/app/srs_app_rtc_conn.hpp
@@ -165,7 +165,8 @@ protected:
     int _parent_cid;
 private:
     SrsRtcSession* rtc_session;
-    SrsUdpMuxSocket ukt;
+public:
+    SrsUdpMuxSocket* sendonly_ukt;
 public:
     SrsRtcSenderThread(SrsRtcSession* s, SrsUdpMuxSocket* u, int parent_cid);
     virtual ~SrsRtcSenderThread();
@@ -177,6 +178,8 @@ public:
     virtual void stop_loop();
 public:
     virtual srs_error_t cycle();
+public:
+    void update_sendonly_socket(SrsUdpMuxSocket* ukt);
 private:
     void send_and_free_messages(SrsSharedPtrMessage** msgs, int nb_msgs, SrsUdpMuxSocket* udp_mux_skt);
 };