diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index 1816273d8..72fabbb85 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -647,9 +647,6 @@ srs_error_t SrsRtcPlayStream::send_packets(SrsRtcStream* source, const vector<Sr
             // TODO: FIXME: Any simple solution?
             SrsRtcAudioSendTrack* audio_track = audio_tracks_[pkt->header.get_ssrc()];
 
-            // The player may change the PT, so it's not equal to publisher's.
-            pkt->header.set_payload_type(audio_track->get_track_media_pt());
-
             if ((err = audio_track->on_rtp(pkt, info)) != srs_success) {
                 return srs_error_wrap(err, "audio track, SSRC=%u, SEQ=%u", pkt->header.get_ssrc(), pkt->header.get_sequence());
             }
@@ -659,9 +656,6 @@ srs_error_t SrsRtcPlayStream::send_packets(SrsRtcStream* source, const vector<Sr
             // TODO: FIXME: Any simple solution?
             SrsRtcVideoSendTrack* video_track = video_tracks_[pkt->header.get_ssrc()];
 
-            // The player may change the PT, so it's not equal to publisher's.
-            pkt->header.set_payload_type(video_track->get_track_media_pt());
-
             if ((err = video_track->on_rtp(pkt, info)) != srs_success) {
                 return srs_error_wrap(err, "video track, SSRC=%u, SEQ=%u", pkt->header.get_ssrc(), pkt->header.get_sequence());
             }
diff --git a/trunk/src/app/srs_app_rtc_source.cpp b/trunk/src/app/srs_app_rtc_source.cpp
index adf54960c..5dee80776 100644
--- a/trunk/src/app/srs_app_rtc_source.cpp
+++ b/trunk/src/app/srs_app_rtc_source.cpp
@@ -1170,13 +1170,13 @@ void SrsRtcDummyBridger::on_unpublish()
 
 SrsCodecPayload::SrsCodecPayload()
 {
-    pt_ = 0;
+    pt_of_publisher_ = pt_ = 0;
     sample_ = 0;
 }
 
 SrsCodecPayload::SrsCodecPayload(uint8_t pt, std::string encode_name, int sample)
 {
-    pt_ = pt;
+    pt_of_publisher_ = pt_ = pt;
     name_ = encode_name;
     sample_ = sample;
 }
@@ -1191,6 +1191,7 @@ SrsCodecPayload* SrsCodecPayload::copy()
 
     cp->type_ = type_;
     cp->pt_ = pt_;
+    cp->pt_of_publisher_ = cp->pt_of_publisher_;
     cp->name_ = name_;
     cp->sample_ = sample_;
     cp->rtcp_fbs_ = rtcp_fbs_;
@@ -1941,11 +1942,6 @@ std::string SrsRtcSendTrack::get_track_id()
     return track_desc_->id_;
 }
 
-int SrsRtcSendTrack::get_track_media_pt()
-{
-    return track_desc_->media_->pt_;
-}
-
 void SrsRtcSendTrack::on_recv_nack()
 {
     SrsRtcTrackStatistic* statistic = statistic_;
@@ -1972,6 +1968,17 @@ srs_error_t SrsRtcAudioSendTrack::on_rtp(SrsRtpPacket2* pkt, SrsRtcPlayStreamSta
 
     pkt->header.set_ssrc(track_desc_->ssrc_);
 
+    // Should update PT, because subscriber may use different PT to publisher.
+    if (track_desc_->media_ && pkt->header.get_payload_type() == track_desc_->media_->pt_of_publisher_) {
+        // If PT is media from publisher, change to PT of media for subscriber.
+        pkt->header.set_payload_type(track_desc_->media_->pt_);
+    } else if (track_desc_->red_ && pkt->header.get_payload_type() == track_desc_->red_->pt_of_publisher_) {
+        // If PT is RED from publisher, change to PT of RED for subscriber.
+        pkt->header.set_payload_type(track_desc_->red_->pt_);
+    } else {
+        // TODO: FIXME: Should update PT for RTX.
+    }
+
     // Put rtp packet to NACK/ARQ queue
     if (true) {
         SrsRtpPacket2* nack = pkt->copy();
@@ -2028,6 +2035,17 @@ srs_error_t SrsRtcVideoSendTrack::on_rtp(SrsRtpPacket2* pkt, SrsRtcPlayStreamSta
     
     pkt->header.set_ssrc(track_desc_->ssrc_);
 
+    // Should update PT, because subscriber may use different PT to publisher.
+    if (track_desc_->media_ && pkt->header.get_payload_type() == track_desc_->media_->pt_of_publisher_) {
+        // If PT is media from publisher, change to PT of media for subscriber.
+        pkt->header.set_payload_type(track_desc_->media_->pt_);
+    } else if (track_desc_->red_ && pkt->header.get_payload_type() == track_desc_->red_->pt_of_publisher_) {
+        // If PT is RED from publisher, change to PT of RED for subscriber.
+        pkt->header.set_payload_type(track_desc_->red_->pt_);
+    } else {
+        // TODO: FIXME: Should update PT for RTX.
+    }
+
     // Put rtp packet to NACK/ARQ queue
     if (true) {
         SrsRtpPacket2* nack = pkt->copy();
diff --git a/trunk/src/app/srs_app_rtc_source.hpp b/trunk/src/app/srs_app_rtc_source.hpp
index 57736cdeb..e2b7d5f2b 100644
--- a/trunk/src/app/srs_app_rtc_source.hpp
+++ b/trunk/src/app/srs_app_rtc_source.hpp
@@ -280,6 +280,9 @@ class SrsCodecPayload
 public:
     std::string type_;
     uint8_t pt_;
+    // for publish, equals to PT of itself;
+    // for subscribe, is the PT of publisher;
+    uint8_t pt_of_publisher_;
     std::string name_;
     int sample_;
 
@@ -562,7 +565,6 @@ public:
     bool set_track_status(bool active);
     bool get_track_status();
     std::string get_track_id();
-    int get_track_media_pt();
 public:
     virtual srs_error_t on_rtp(SrsRtpPacket2* pkt, SrsRtcPlayStreamStatistic& info) = 0;
     virtual srs_error_t on_rtcp(SrsRtpPacket2* pkt) = 0;