diff --git a/webrtc/Sdp.cpp b/webrtc/Sdp.cpp
index dae5d776..d4a1d8f3 100644
--- a/webrtc/Sdp.cpp
+++ b/webrtc/Sdp.cpp
@@ -161,9 +161,99 @@ const char* getRtpDirectionString(RtpDirection val){
 
 //////////////////////////////////////////////////////////////////////////////////////////
 
+string RtcSdpBase::toString() const {
+    _StrPrinter printer;
+    for (auto &item : items) {
+        printer << item->getKey() << "=" << item->toString() << "\r\n";
+    }
+    return std::move(printer);
+}
+
+RtpDirection RtcSdpBase::getDirection() const{
+    for (auto &item : items) {
+        auto attr = dynamic_pointer_cast<SdpAttr>(item);
+        if (attr) {
+            auto dir = dynamic_pointer_cast<DirectionInterface>(attr->detail);
+            if (dir) {
+                return dir->getDirection();
+            }
+        }
+    }
+    return RtpDirection::invalid;
+}
+
+SdpItem::Ptr RtcSdpBase::getItem(char key, const char *attr_key) const {
+    for (auto item : items) {
+        if (item->getKey()[0] == key) {
+            if (!attr_key) {
+                return item;
+            }
+            auto attr = dynamic_pointer_cast<SdpAttr>(item);
+            if (attr && attr->detail->getKey() == attr_key) {
+                return item;
+            }
+        }
+    }
+    return SdpItem::Ptr();
+}
+
+int RtcSdpBase::getVersion() const {
+    return atoi(getStringItem('v').data());
+}
+
+SdpOrigin RtcSdpBase::getOrigin() const {
+    return getItemClass<SdpOrigin>('o');
+}
+
+string RtcSdpBase::getSessionName() const {
+    return getStringItem('s');
+}
+
+string RtcSdpBase::getSessionInfo() const {
+    return getStringItem('i');
+}
+
+SdpTime RtcSdpBase::getSessionTime() const{
+    return getItemClass<SdpTime>('t');
+}
+
+SdpConnection RtcSdpBase::getConnection() const {
+    return getItemClass<SdpConnection>('c');
+}
+
+SdpBandwidth RtcSdpBase::getBandwidth() const {
+    return getItemClass<SdpBandwidth>('b');
+}
+
+string RtcSdpBase::getUri() const {
+    return getStringItem('u');
+}
+
+string RtcSdpBase::getEmail() const {
+    return getStringItem('e');
+}
+
+string RtcSdpBase::getPhone() const {
+    return getStringItem('p');
+}
+
+string RtcSdpBase::getTimeZone() const {
+    return getStringItem('z');
+}
+
+string RtcSdpBase::getEncryptKey() const {
+    return getStringItem('k');
+}
+
+string RtcSdpBase::getRepeatTimes() const {
+    return getStringItem('r');
+}
+
+//////////////////////////////////////////////////////////////////////
+
 void RtcSessionSdp::parse(const string &str) {
     static auto flag = registerAllItem();
-    RtcMediaSdp *media = nullptr;
+    RtcSdpBase *media = nullptr;
     auto lines = split(str, "\n");
     for(auto &line : lines){
         trim(line);
@@ -173,7 +263,7 @@ void RtcSessionSdp::parse(const string &str) {
         auto key = line.substr(0, 1);
         auto value = line.substr(2);
         if (key == "m") {
-            medias.emplace_back(RtcMediaSdp());
+            medias.emplace_back(RtcSdpBase());
             media = &medias.back();
         }
 
@@ -195,9 +285,7 @@ void RtcSessionSdp::parse(const string &str) {
 
 string RtcSessionSdp::toString() const {
     _StrPrinter printer;
-    for (auto &item : items) {
-        printer << item->getKey() << "=" << item->toString() << "\r\n";
-    }
+    printer << RtcSdpBase::toString();
     for (auto &media : medias) {
         printer << media.toString();
     }
@@ -205,30 +293,6 @@ string RtcSessionSdp::toString() const {
     return std::move(printer);
 }
 
-//////////////////////////////////////////////////////////////////////
-
-string RtcMediaSdp::toString() const {
-    _StrPrinter printer;
-    for (auto &item : items) {
-        printer << item->getKey() << "=" << item->toString() << "\r\n";
-    }
-    return std::move(printer);
-}
-
-RtpDirection RtcMediaSdp::getDirection() const{
-    for (auto &item : items) {
-        auto attr = dynamic_pointer_cast<SdpAttr>(item);
-        if (attr) {
-            auto dir = dynamic_pointer_cast<DirectionInterface>(attr->detail);
-            if (dir) {
-                return dir->getDirection();
-            }
-        }
-    }
-    return RtpDirection::invalid;
-}
-
-
 //////////////////////////////////////////////////////////////////////////////////////////
 
 #define SDP_THROW() throw std::invalid_argument(StrPrinter << "解析sdp " << getKey() << " 字段失败:" << str)
diff --git a/webrtc/Sdp.h b/webrtc/Sdp.h
index 325c11c0..381f51c3 100644
--- a/webrtc/Sdp.h
+++ b/webrtc/Sdp.h
@@ -421,22 +421,55 @@ public:
     const char* getKey() const override { return "candidate";}
 };
 
-class RtcMediaSdp {
+class RtcSdpBase {
 public:
     vector<SdpItem::Ptr> items;
-    string toString() const;
-    bool haveAttr(const char *attr) const;
-    string getAttrValue(const char *attr) const;
+
+public:
+    virtual string toString() const;
+
+    int getVersion() const;
+    SdpOrigin getOrigin() const;
+    string getSessionName() const;
+    string getSessionInfo() const;
+    SdpTime getSessionTime() const;
+    SdpConnection getConnection() const;
+    SdpBandwidth getBandwidth() const;
+
+    string getUri() const;
+    string getEmail() const;
+    string getPhone() const;
+    string getTimeZone() const;
+    string getEncryptKey() const;
+    string getRepeatTimes() const;
     RtpDirection getDirection() const;
+
+private:
+    SdpItem::Ptr getItem(char key, const char *attr_key = nullptr) const;
+
+    template<typename cls>
+    cls getItemClass(char key, const char *attr_key = nullptr) const{
+        auto item = dynamic_pointer_cast<cls>(getItem(key, attr_key));
+        if (!item) {
+            return cls();
+        }
+        return *item;
+    }
+
+    string getStringItem(char key, const char *attr_key = nullptr) const{
+        auto item = getItem(key, attr_key);
+        if (!item) {
+            return "";
+        }
+        return item->toString();
+    }
 };
 
-class RtcSessionSdp {
+class RtcSessionSdp : public RtcSdpBase{
 public:
-    vector<SdpItem::Ptr> items;
-    vector<RtcMediaSdp> medias;
-
+    vector<RtcSdpBase> medias;
     void parse(const string &str);
-    string toString() const;
+    string toString() const override;
 };
 
 //////////////////////////////////////////////////////////////////
@@ -468,12 +501,12 @@ public:
     uint32_t sample_rate;
     //音频时有效
     uint32_t channel = 0;
-    vector<std::pair<string/*key*/, string/*value*/> > fmtp;
     vector<string> rtcp_fb;
+    vector<std::pair<string/*key*/, string/*value*/> > fmtp;
 };
 
 //rtc 媒体描述
-class RtcCodec{
+class RtcMedia{
 public:
     TrackType type;
     string mid;
@@ -508,6 +541,17 @@ public:
     vector<SdpAttrExtmap> extmap;
 };
 
+class RtcSession{
+public:
+    int version;
+    SdpOrigin origin;
+    string session_name;
+    string session_info;
+    SdpConnection connection;
+    SdpBandwidth bandwidth;
+    set<TrackType> group_bundle;
+    vector<RtcMedia> media;
+};
 
 
 #endif //ZLMEDIAKIT_SDP_H