diff --git a/src/Extension/Factory.cpp b/src/Extension/Factory.cpp
index 4bdb965c..037c5f98 100644
--- a/src/Extension/Factory.cpp
+++ b/src/Extension/Factory.cpp
@@ -84,6 +84,14 @@ Track::Ptr Factory::getTrackBySdp(const SdpTrack::Ptr &track) {
         return std::make_shared<H265Track>(vps,sps,pps,0,0,0);
     }
 
+    //可以根据传统的payload type 获取编码类型以及采样率等信息
+    CodecId codec_id = RtpPayload::getCodecId(track->_pt);
+    switch (codec_id){
+        case CodecG711A :
+        case CodecG711U : return std::make_shared<G711Track>(codec_id,  track->_samplerate, track->_channel, 16);
+        default : break;
+    }
+
     WarnL << "暂不支持该sdp:" << track->getName();
     return nullptr;
 }
diff --git a/src/Rtsp/Rtsp.cpp b/src/Rtsp/Rtsp.cpp
index 7828b5dc..03c24c7d 100644
--- a/src/Rtsp/Rtsp.cpp
+++ b/src/Rtsp/Rtsp.cpp
@@ -16,7 +16,7 @@ namespace mediakit{
 
 int RtpPayload::getClockRate(int pt){
     switch (pt){
-#define SWITCH_CASE(name, type, value, clock_rate, channel) case value :  return clock_rate;
+#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value :  return clock_rate;
         RTP_PT_MAP(SWITCH_CASE)
 #undef SWITCH_CASE
         default: return 90000;
@@ -25,7 +25,7 @@ int RtpPayload::getClockRate(int pt){
 
 TrackType RtpPayload::getTrackType(int pt){
     switch (pt){
-#define SWITCH_CASE(name, type, value, clock_rate, channel) case value :  return type;
+#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value :  return type;
         RTP_PT_MAP(SWITCH_CASE)
 #undef SWITCH_CASE
         default: return TrackInvalid;
@@ -34,7 +34,7 @@ TrackType RtpPayload::getTrackType(int pt){
 
 int RtpPayload::getAudioChannel(int pt){
     switch (pt){
-#define SWITCH_CASE(name, type, value, clock_rate, channel) case value :  return channel;
+#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value :  return channel;
         RTP_PT_MAP(SWITCH_CASE)
 #undef SWITCH_CASE
         default: return 1;
@@ -43,13 +43,22 @@ int RtpPayload::getAudioChannel(int pt){
 
 const char * RtpPayload::getName(int pt){
     switch (pt){
-#define SWITCH_CASE(name, type, value, clock_rate, channel) case value :  return #name;
+#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value :  return #name;
         RTP_PT_MAP(SWITCH_CASE)
 #undef SWITCH_CASE
         default: return "unknown payload type";
     }
 }
 
+CodecId RtpPayload::getCodecId(int pt) {
+    switch (pt) {
+#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value :  return codec_id;
+        RTP_PT_MAP(SWITCH_CASE)
+#undef SWITCH_CASE
+        default : return CodecInvalid;
+    }
+}
+
 static void getAttrSdp(const map<string, string> &attr, _StrPrinter &printer){
     const map<string, string>::value_type *ptr = nullptr;
     for(auto &pr : attr){
@@ -70,7 +79,7 @@ static void getAttrSdp(const map<string, string> &attr, _StrPrinter &printer){
 
 string SdpTrack::getName() const{
     switch (_pt){
-#define SWITCH_CASE(name, type, value, clock_rate, channel) case value :  return #name;
+#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value :  return #name;
         RTP_PT_MAP(SWITCH_CASE)
 #undef SWITCH_CASE
         default: return _codec;
diff --git a/src/Rtsp/Rtsp.h b/src/Rtsp/Rtsp.h
index bf8040a3..0a42add5 100644
--- a/src/Rtsp/Rtsp.h
+++ b/src/Rtsp/Rtsp.h
@@ -34,33 +34,33 @@ typedef enum {
 } eRtpType;
 
 #define RTP_PT_MAP(XX) \
-    XX(PCMU, TrackAudio, 0, 8000, 1) \
-    XX(GSM, TrackAudio , 3, 8000, 1) \
-    XX(G723, TrackAudio, 4, 8000, 1) \
-    XX(DVI4_8000, TrackAudio, 5, 8000, 1) \
-    XX(DVI4_16000, TrackAudio, 6, 16000, 1) \
-    XX(LPC, TrackAudio, 7, 8000, 1) \
-    XX(PCMA, TrackAudio, 8, 8000, 1) \
-    XX(G722, TrackAudio, 9, 8000, 1) \
-    XX(L16_Stereo, TrackAudio, 10, 44100, 2) \
-    XX(L16_Mono, TrackAudio, 11, 44100, 1) \
-    XX(QCELP, TrackAudio, 12, 8000, 1) \
-    XX(CN, TrackAudio, 13, 8000, 1) \
-    XX(MPA, TrackAudio, 14, 90000, 1) \
-    XX(G728, TrackAudio, 15, 8000, 1) \
-    XX(DVI4_11025, TrackAudio, 16, 11025, 1) \
-    XX(DVI4_22050, TrackAudio, 17, 22050, 1) \
-    XX(G729, TrackAudio, 18, 8000, 1) \
-    XX(CelB, TrackVideo, 25, 90000, 1) \
-    XX(JPEG, TrackVideo, 26, 90000, 1) \
-    XX(nv, TrackVideo, 28, 90000, 1) \
-    XX(H261, TrackVideo, 31, 90000, 1) \
-    XX(MPV, TrackVideo, 32, 90000, 1) \
-    XX(MP2T, TrackVideo, 33, 90000, 1) \
-    XX(H263, TrackVideo, 34, 90000, 1) \
+    XX(PCMU, TrackAudio, 0, 8000, 1, CodecG711U) \
+    XX(GSM, TrackAudio , 3, 8000, 1, CodecInvalid) \
+    XX(G723, TrackAudio, 4, 8000, 1, CodecInvalid) \
+    XX(DVI4_8000, TrackAudio, 5, 8000, 1, CodecInvalid) \
+    XX(DVI4_16000, TrackAudio, 6, 16000, 1, CodecInvalid) \
+    XX(LPC, TrackAudio, 7, 8000, 1, CodecInvalid) \
+    XX(PCMA, TrackAudio, 8, 8000, 1, CodecG711A) \
+    XX(G722, TrackAudio, 9, 8000, 1, CodecInvalid) \
+    XX(L16_Stereo, TrackAudio, 10, 44100, 2, CodecInvalid) \
+    XX(L16_Mono, TrackAudio, 11, 44100, 1, CodecInvalid) \
+    XX(QCELP, TrackAudio, 12, 8000, 1, CodecInvalid) \
+    XX(CN, TrackAudio, 13, 8000, 1, CodecInvalid) \
+    XX(MPA, TrackAudio, 14, 90000, 1, CodecInvalid) \
+    XX(G728, TrackAudio, 15, 8000, 1, CodecInvalid) \
+    XX(DVI4_11025, TrackAudio, 16, 11025, 1, CodecInvalid) \
+    XX(DVI4_22050, TrackAudio, 17, 22050, 1, CodecInvalid) \
+    XX(G729, TrackAudio, 18, 8000, 1, CodecInvalid) \
+    XX(CelB, TrackVideo, 25, 90000, 1, CodecInvalid) \
+    XX(JPEG, TrackVideo, 26, 90000, 1, CodecInvalid) \
+    XX(nv, TrackVideo, 28, 90000, 1, CodecInvalid) \
+    XX(H261, TrackVideo, 31, 90000, 1, CodecInvalid) \
+    XX(MPV, TrackVideo, 32, 90000, 1, CodecInvalid) \
+    XX(MP2T, TrackVideo, 33, 90000, 1, CodecInvalid) \
+    XX(H263, TrackVideo, 34, 90000, 1, CodecInvalid) \
 
 typedef enum {
-#define ENUM_DEF(name, type, value, clock_rate, channel) PT_ ## name = value,
+#define ENUM_DEF(name, type, value, clock_rate, channel, codec_id) PT_ ## name = value,
     RTP_PT_MAP(ENUM_DEF)
 #undef ENUM_DEF
     PT_MAX = 128
@@ -88,6 +88,7 @@ public:
     static TrackType getTrackType(int pt);
     static int getAudioChannel(int pt);
     static const char *getName(int pt);
+    static CodecId getCodecId(int pt);
 private:
     RtpPayload() = delete;
     ~RtpPayload() = delete;