diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index 2570b91a7..00cd9928b 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -794,6 +794,9 @@ srs_error_t SrsRtcSenderThread::cycle()
     srs_trace("RTC source url=%s, source_id=[%d][%d], encrypt=%d, realtime=%d, mw_sleep=%dms, mw_msgs=%d", req->get_stream_url().c_str(),
         ::getpid(), source->source_id(), rtc_session->encrypt, realtime, srsu2msi(mw_sleep), mw_msgs);
 
+    // For RTC, notify the source to fetch keyframe for this client.
+    source->request_keyframe();
+
     SrsMessageArray msgs(SRS_PERF_MW_MSGS);
     SrsRtcPackets pkts(SRS_PERF_RTC_RTP_PACKETS);
 
@@ -1517,6 +1520,8 @@ SrsRtcPublisher::SrsRtcPublisher(SrsRtcSession* session)
 
 SrsRtcPublisher::~SrsRtcPublisher()
 {
+    source->set_rtc_publisher(NULL);
+
     // TODO: FIXME: Do unpublish when session timeout.
     if (source) {
         source->on_unpublish();
@@ -1559,6 +1564,8 @@ srs_error_t SrsRtcPublisher::initialize(SrsUdpMuxSocket* skt, uint32_t vssrc, ui
         return srs_error_wrap(err, "on publish");
     }
 
+    source->set_rtc_publisher(this);
+
     return err;
 }
 
@@ -1745,7 +1752,7 @@ void SrsRtcPublisher::check_send_nacks(SrsRtpQueue* rtp_queue, uint32_t ssrc, Sr
     }
 
     vector<uint16_t> nack_seqs;
-    rtp_queue->nack_.get_nack_seqs(nack_seqs);
+    rtp_queue->get_nack_seqs(nack_seqs);
     vector<uint16_t>::iterator iter = nack_seqs.begin();
     while (iter != nack_seqs.end()) {
         char buf[kRtpPacketSize];
@@ -1912,7 +1919,7 @@ srs_error_t SrsRtcPublisher::send_rtcp_fb_pli(SrsUdpMuxSocket* skt, uint32_t ssr
     stream.write_4bytes(ssrc);
     stream.write_4bytes(ssrc);
     
-    srs_verbose("PLI ssrc=%u", ssrc);
+    srs_trace("RTC PLI ssrc=%u", ssrc);
     
     char protected_buf[kRtpPacketSize];
     int nb_protected_buf = stream.pos();
@@ -1985,6 +1992,7 @@ srs_error_t SrsRtcPublisher::on_video(SrsUdpMuxSocket* skt, SrsRtpSharedPacket*
     rtp_video_queue->insert(rtp_pkt);
 
     if (rtp_video_queue->get_and_clean_if_needed_request_key_frame()) {
+        // TODO: FIXME: Check error.
         send_rtcp_fb_pli(skt, video_ssrc);
     }
 
@@ -2148,6 +2156,15 @@ void SrsRtcPublisher::update_sendonly_socket(SrsUdpMuxSocket* skt)
     sendonly_ukt = skt->copy_sendonly();
 }
 
+void SrsRtcPublisher::request_keyframe()
+{
+    int scid = _srs_context->get_id();
+    int pcid = rtc_session->context_id();
+    srs_trace("RTC play=[%d][%d] request keyframe from publish=[%d][%d]", ::getpid(), scid, ::getpid(), pcid);
+
+    rtp_video_queue->request_keyframe();
+}
+
 srs_error_t SrsRtcPublisher::notify(int type, srs_utime_t interval, srs_utime_t tick)
 {
     if (sendonly_ukt) {
@@ -3172,7 +3189,7 @@ srs_error_t SrsRtcServer::create_rtc_session(
     }
 
     // TODO: FIXME: Refine the API for stream status manage.
-    if (!source->can_publish(false)) {
+    if (publish && !source->can_publish(false)) {
         return srs_error_new(ERROR_RTC_SOURCE_BUSY, "stream %s busy", req->get_stream_url().c_str());
     }
 
diff --git a/trunk/src/app/srs_app_rtc_conn.hpp b/trunk/src/app/srs_app_rtc_conn.hpp
index 793813abb..42bbe0f6e 100644
--- a/trunk/src/app/srs_app_rtc_conn.hpp
+++ b/trunk/src/app/srs_app_rtc_conn.hpp
@@ -299,6 +299,7 @@ private:
     srs_error_t collect_video_frame();
 public:
     void update_sendonly_socket(SrsUdpMuxSocket* skt);
+    void request_keyframe();
 // interface ISrsHourGlass
 public:
     virtual srs_error_t notify(int type, srs_utime_t interval, srs_utime_t tick);
@@ -359,6 +360,7 @@ public:
     void set_encrypt(bool v) { encrypt = v; }
 
     void switch_to_context();
+    int context_id() { return cid; }
 public:
     srs_error_t initialize();
     srs_error_t on_stun(SrsUdpMuxSocket* skt, SrsStunPacket* stun_req);
diff --git a/trunk/src/app/srs_app_rtp_queue.cpp b/trunk/src/app/srs_app_rtp_queue.cpp
index 28637e738..3e5d3a8cb 100644
--- a/trunk/src/app/srs_app_rtp_queue.cpp
+++ b/trunk/src/app/srs_app_rtp_queue.cpp
@@ -41,7 +41,7 @@ SrsRtpNackInfo::SrsRtpNackInfo()
     req_nack_count_ = 0;
 }
 
-SrsRtpNackList::SrsRtpNackList(SrsRtpQueue* rtp_queue, size_t queue_size)
+SrsRtpNackForReceiver::SrsRtpNackForReceiver(SrsRtpQueue* rtp_queue, size_t queue_size)
 {
     max_queue_size_ = queue_size;
     rtp_queue_ = rtp_queue;
@@ -51,23 +51,23 @@ SrsRtpNackList::SrsRtpNackList(SrsRtpQueue* rtp_queue, size_t queue_size)
         max_queue_size_, opts_.max_count, opts_.max_alive_time, opts.first_nack_interval, opts_.nack_interval);
 }
 
-SrsRtpNackList::~SrsRtpNackList()
+SrsRtpNackForReceiver::~SrsRtpNackForReceiver()
 {
 }
 
-void SrsRtpNackList::insert(uint16_t seq)
+void SrsRtpNackForReceiver::insert(uint16_t seq)
 {
     // FIXME: full, drop packet, and request key frame.
     SrsRtpNackInfo& nack_info = queue_[seq];
     (void)nack_info;
 }
 
-void SrsRtpNackList::remove(uint16_t seq)
+void SrsRtpNackForReceiver::remove(uint16_t seq)
 {
     queue_.erase(seq);
 }
 
-SrsRtpNackInfo* SrsRtpNackList::find(uint16_t seq)
+SrsRtpNackInfo* SrsRtpNackForReceiver::find(uint16_t seq)
 {
     std::map<uint16_t, SrsRtpNackInfo>::iterator iter = queue_.find(seq);
     
@@ -78,7 +78,7 @@ SrsRtpNackInfo* SrsRtpNackList::find(uint16_t seq)
     return &(iter->second);
 }
 
-void SrsRtpNackList::check_queue_size()
+void SrsRtpNackForReceiver::check_queue_size()
 {
     if (queue_.size() >= max_queue_size_) {
         srs_verbose("NACK list full, queue size=%u, max_queue_size=%u", queue_.size(), max_queue_size_);
@@ -86,7 +86,7 @@ void SrsRtpNackList::check_queue_size()
     }
 }
 
-void SrsRtpNackList::get_nack_seqs(vector<uint16_t>& seqs)
+void SrsRtpNackForReceiver::get_nack_seqs(vector<uint16_t>& seqs)
 {
     srs_utime_t now = srs_update_system_time();
     int interval = now - pre_check_time_;
@@ -126,7 +126,7 @@ void SrsRtpNackList::get_nack_seqs(vector<uint16_t>& seqs)
     }
 }
 
-void SrsRtpNackList::update_rtt(int rtt)
+void SrsRtpNackForReceiver::update_rtt(int rtt)
 {
     rtt_ = rtt * SRS_UTIME_MILLISECONDS;
     srs_verbose("NACK, update rtt from %ld to %d", opts_.nack_interval, rtt_);
@@ -244,10 +244,10 @@ void SrsRtpRingBuffer::update(uint16_t seq, bool startup, uint16_t& nack_low, ui
 }
 
 SrsRtpQueue::SrsRtpQueue(size_t capacity, bool one_packet_per_frame)
-    : nack_(this, capacity * 2 / 3)
 {
     nn_collected_frames = 0;
     queue_ = new SrsRtpRingBuffer(capacity);
+    nack_ = new SrsRtpNackForReceiver(this, capacity * 2 / 3);
 
     jitter_ = 0;
     last_trans_time_ = -1;
@@ -266,6 +266,7 @@ SrsRtpQueue::SrsRtpQueue(size_t capacity, bool one_packet_per_frame)
 SrsRtpQueue::~SrsRtpQueue()
 {
     srs_freep(queue_);
+    srs_freep(nack_);
 }
 
 srs_error_t SrsRtpQueue::insert(SrsRtpSharedPacket* rtp_pkt)
@@ -276,13 +277,13 @@ srs_error_t SrsRtpQueue::insert(SrsRtpSharedPacket* rtp_pkt)
     srs_utime_t now = srs_update_system_time();
 
     uint16_t seq = rtp_pkt->rtp_header.get_sequence();
-    SrsRtpNackInfo* nack_info = nack_.find(seq);
+    SrsRtpNackInfo* nack_info = nack_->find(seq);
     if (nack_info) {
         int nack_rtt = nack_info->req_nack_count_ ? ((now - nack_info->pre_req_nack_time_) / SRS_UTIME_MILLISECONDS) : 0;
         (void)nack_rtt;
         srs_verbose("seq=%u, alive time=%d, nack count=%d, rtx success, resend use %dms",
             seq, now - nack_info->generate_time_, nack_info->req_nack_count_, nack_rtt);
-        nack_.remove(seq);
+        nack_->remove(seq);
     }
 
     // Calc jitter time, ignore nack packets.
@@ -328,7 +329,7 @@ srs_error_t SrsRtpQueue::insert(SrsRtpSharedPacket* rtp_pkt)
         srs_trace("seqs out of range, seq range [%u, %u]", queue_->low(), next);
 
         for (uint16_t s = queue_->low(); s != next; ++s) {
-            nack_.remove(s);
+            nack_->remove(s);
             queue_->remove(s);
         }
 
@@ -359,6 +360,7 @@ bool SrsRtpQueue::get_and_clean_if_needed_request_key_frame()
 {
     if (request_key_frame_) {
         request_key_frame_ = false;
+        return true;
     }
 
     return request_key_frame_;
@@ -421,20 +423,25 @@ uint32_t SrsRtpQueue::get_interarrival_jitter()
     return static_cast<uint32_t>(jitter_);
 }
 
+void SrsRtpQueue::get_nack_seqs(vector<uint16_t>& seqs)
+{
+    nack_->get_nack_seqs(seqs);
+}
+
 void SrsRtpQueue::update_rtt(int rtt)
 {
-    nack_.update_rtt(rtt);
+    nack_->update_rtt(rtt);
 }
 
 void SrsRtpQueue::insert_into_nack_list(uint16_t seq_start, uint16_t seq_end)
 {
     for (uint16_t s = seq_start; s != seq_end; ++s) {
         srs_verbose("loss seq=%u, insert into nack list", s);
-        nack_.insert(s);
+        nack_->insert(s);
         ++number_of_packet_lossed_;
     }
 
-    nack_.check_queue_size();
+    nack_->check_queue_size();
 }
 
 void SrsRtpQueue::collect_packet()
@@ -443,7 +450,7 @@ void SrsRtpQueue::collect_packet()
     for (uint16_t s = queue_->low(); s != queue_->high(); ++s) {
         SrsRtpSharedPacket* pkt = queue_->at(s);
 
-        if (nack_.find(s) != NULL) {
+        if (nack_->find(s) != NULL) {
             srs_verbose("seq=%u, found in nack list when collect frame", s);
             break;
         }
diff --git a/trunk/src/app/srs_app_rtp_queue.hpp b/trunk/src/app/srs_app_rtp_queue.hpp
index 70631e801..7483f297b 100644
--- a/trunk/src/app/srs_app_rtp_queue.hpp
+++ b/trunk/src/app/srs_app_rtp_queue.hpp
@@ -71,7 +71,7 @@ inline bool srs_rtp_seq_distance(const uint16_t& low, const uint16_t& high)
     return ((int16_t)(high - low)) > 0;
 }
 
-class SrsRtpNackList
+class SrsRtpNackForReceiver
 {
 private:
     struct SeqComp {
@@ -91,8 +91,8 @@ private:
 private:
     int rtt_;
 public:
-    SrsRtpNackList(SrsRtpQueue* rtp_queue, size_t queue_size);
-    virtual ~SrsRtpNackList();
+    SrsRtpNackForReceiver(SrsRtpQueue* rtp_queue, size_t queue_size);
+    virtual ~SrsRtpNackForReceiver();
 public:
     void insert(uint16_t seq);
     void remove(uint16_t seq);
@@ -159,6 +159,7 @@ class SrsRtpQueue
 private:
     uint64_t nn_collected_frames;
     SrsRtpRingBuffer* queue_;
+    SrsRtpNackForReceiver* nack_;
 private:
     double jitter_;
     // TODO: FIXME: Covert time to srs_utime_t.
@@ -169,8 +170,6 @@ private:
     uint64_t number_of_packet_lossed_;
 private:
     bool one_packet_per_frame_;
-public:
-    SrsRtpNackList nack_;
 private:
     std::vector<std::vector<SrsRtpSharedPacket*> > frames_;
     bool request_key_frame_;
@@ -184,12 +183,14 @@ public:
     bool get_and_clean_if_needed_request_key_frame();
     void notify_drop_seq(uint16_t seq);
     void notify_nack_list_full();
+    void request_keyframe() { request_key_frame_ = true; }
 public:
     uint32_t get_extended_highest_sequence();
     uint8_t get_fraction_lost();
     uint32_t get_cumulative_number_of_packets_lost();
     uint32_t get_interarrival_jitter();
 public:
+    void get_nack_seqs(std::vector<uint16_t>& seqs);
     void update_rtt(int rtt);
 private:
     void insert_into_nack_list(uint16_t seq_start, uint16_t seq_end);
diff --git a/trunk/src/app/srs_app_source.cpp b/trunk/src/app/srs_app_source.cpp
index 3f543915a..989abbb12 100755
--- a/trunk/src/app/srs_app_source.cpp
+++ b/trunk/src/app/srs_app_source.cpp
@@ -52,6 +52,7 @@ using namespace std;
 #include <srs_protocol_format.hpp>
 #ifdef SRS_RTC
 #include <srs_app_rtc.hpp>
+#include <srs_app_rtc_conn.hpp>
 #endif
 
 #define CONST_MAX_JITTER_MS         250
@@ -1966,6 +1967,10 @@ SrsSource::SrsSource()
     
     _srs_config->subscribe(this);
     atc = false;
+
+#ifdef SRS_RTC
+    rtc_publisher = NULL;
+#endif
 }
 
 SrsSource::~SrsSource()
@@ -2749,4 +2754,11 @@ SrsMetaCache* SrsSource::cached_meta()
 {
     return meta;
 }
+
+void SrsSource::request_keyframe()
+{
+    if (rtc_publisher) {
+        rtc_publisher->request_keyframe();
+    }
+}
 #endif
diff --git a/trunk/src/app/srs_app_source.hpp b/trunk/src/app/srs_app_source.hpp
index fcc6c84d4..8194b46ff 100644
--- a/trunk/src/app/srs_app_source.hpp
+++ b/trunk/src/app/srs_app_source.hpp
@@ -63,6 +63,9 @@ class SrsBuffer;
 class SrsHds;
 #endif
 class SrsRtpSharedPacket;
+#ifdef SRS_RTC
+class SrsRtcPublisher;
+#endif
 
 // The time jitter algorithm:
 // 1. full, to ensure stream start at zero, and ensure stream monotonically increasing.
@@ -577,6 +580,10 @@ private:
     // The last die time, when all consumers quit and no publisher,
     // We will remove the source when source die.
     srs_utime_t die_at;
+#ifdef SRS_RTC
+private:
+    SrsRtcPublisher* rtc_publisher;
+#endif
 public:
     SrsSource();
     virtual ~SrsSource();
@@ -639,12 +646,17 @@ public:
     virtual void on_edge_proxy_unpublish();
 public:
     virtual std::string get_curr_origin();
-public:
 #ifdef SRS_RTC
+public:
     // Find rtp packet by sequence
     SrsRtpSharedPacket* find_rtp_packet(const uint16_t& seq);
     // Get the cached meta, as such the sps/pps.
     SrsMetaCache* cached_meta();
+    // Request keyframe for new client.
+    // TODO: FIXME: Maybe we could cache the keyframe.
+    // TODO: FIXME: Maybe we should only response for the new clients.
+    void request_keyframe();
+    void set_rtc_publisher(SrsRtcPublisher* v) { rtc_publisher = v; }
 #endif
 };