diff --git a/server/WebApi.cpp b/server/WebApi.cpp
index eb78f713..d5bb071d 100755
--- a/server/WebApi.cpp
+++ b/server/WebApi.cpp
@@ -40,6 +40,7 @@
 #ifdef ENABLE_WEBRTC
 #include "../webrtc/WebRtcPlayer.h"
 #include "../webrtc/WebRtcPusher.h"
+#include "../webrtc/WebRtcEchoTest.h"
 #endif
 
 using namespace toolkit;
@@ -1271,6 +1272,14 @@ void installWebApi() {
             return;
         }
 
+        if (!strcasecmp(type.data(), "echo")) {
+            auto rtc = WebRtcEchoTest::create(EventPollerPool::Instance().getPoller());
+            val["sdp"] = rtc->getAnswerSdp(offer_sdp);
+            val["type"] = "answer";
+            invoker(200, headerOut, val.toStyledString());
+            return;
+        }
+
         throw ApiRetException("不支持该类型", API::InvalidArgs);
     });
 #endif
diff --git a/webrtc/WebRtcEchoTest.cpp b/webrtc/WebRtcEchoTest.cpp
new file mode 100644
index 00000000..9293d369
--- /dev/null
+++ b/webrtc/WebRtcEchoTest.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
+ *
+ * This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
+ *
+ * Use of this source code is governed by MIT license that can be found in the
+ * LICENSE file in the root of the source tree. All contributing project authors
+ * may be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "WebRtcEchoTest.h"
+
+
+WebRtcEchoTest::Ptr WebRtcEchoTest::create(const EventPoller::Ptr &poller) {
+    WebRtcEchoTest::Ptr ret(new WebRtcEchoTest(poller), [](WebRtcEchoTest *ptr) {
+        ptr->onDestory();
+        delete ptr;
+    });
+    ret->onCreate();
+    return ret;
+}
+
+WebRtcEchoTest::WebRtcEchoTest(const EventPoller::Ptr &poller) : WebRtcTransportImp(poller) {}
+
+void WebRtcEchoTest::onRtcConfigure(RtcConfigure &configure) const {
+    WebRtcTransportImp::onRtcConfigure(configure);
+    configure.audio.direction = configure.video.direction = RtpDirection::sendrecv;
+}
+
+void WebRtcEchoTest::onRtp(const char *buf, size_t len, uint64_t stamp_ms) {
+    updateTicker();
+    sendRtpPacket(buf, len, true, nullptr);
+}
+
+void WebRtcEchoTest::onRtcp(const char *buf, size_t len) {
+    sendRtcpPacket(buf, len, true, nullptr);
+}
+
diff --git a/webrtc/WebRtcEchoTest.h b/webrtc/WebRtcEchoTest.h
new file mode 100644
index 00000000..06ca2dee
--- /dev/null
+++ b/webrtc/WebRtcEchoTest.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
+ *
+ * This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
+ *
+ * Use of this source code is governed by MIT license that can be found in the
+ * LICENSE file in the root of the source tree. All contributing project authors
+ * may be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef ZLMEDIAKIT_WEBRTCECHOTEST_H
+#define ZLMEDIAKIT_WEBRTCECHOTEST_H
+
+#include "WebRtcTransport.h"
+
+class WebRtcEchoTest : public WebRtcTransportImp {
+public:
+    using Ptr = std::shared_ptr<WebRtcEchoTest>;
+    ~WebRtcEchoTest() override = default;
+    static Ptr create(const EventPoller::Ptr &poller);
+
+protected:
+    ///////WebRtcTransportImp override///////
+    void onRtcConfigure(RtcConfigure &configure) const override;
+    void onRtp(const char *buf, size_t len, uint64_t stamp_ms) override;
+    void onRtcp(const char *buf, size_t len) override;
+
+    void onRecvRtp(MediaTrack &track, const string &rid, RtpPacket::Ptr rtp) override {};
+    void onBeforeEncryptRtp(const char *buf, int &len, void *ctx) override {};
+    void onBeforeEncryptRtcp(const char *buf, int &len, void *ctx) override {};
+
+private:
+    WebRtcEchoTest(const EventPoller::Ptr &poller);
+
+};
+
+
+#endif //ZLMEDIAKIT_WEBRTCECHOTEST_H
diff --git a/webrtc/WebRtcPlayer.h b/webrtc/WebRtcPlayer.h
index 4ca5eb75..ade67388 100644
--- a/webrtc/WebRtcPlayer.h
+++ b/webrtc/WebRtcPlayer.h
@@ -24,7 +24,7 @@ protected:
     void onStartWebRTC() override;
     void onDestory() override;
     void onRtcConfigure(RtcConfigure &configure) const override;
-    void onRecvRtp(MediaTrack &track, const string &rid, RtpPacket::Ptr rtp) {};
+    void onRecvRtp(MediaTrack &track, const string &rid, RtpPacket::Ptr rtp) override {};
 
 private:
     WebRtcPlayer(const EventPoller::Ptr &poller, const RtspMediaSource::Ptr &src, const MediaInfo &info);
diff --git a/webrtc/WebRtcTransport.cpp b/webrtc/WebRtcTransport.cpp
index 130ff0f3..38cc1aff 100644
--- a/webrtc/WebRtcTransport.cpp
+++ b/webrtc/WebRtcTransport.cpp
@@ -435,6 +435,10 @@ void WebRtcTransportImp::onCheckAnswer(RtcSession &sdp) {
         if (m.type == TrackApplication) {
             continue;
         }
+        if (!m.rtp_rtx_ssrc.empty()) {
+            //已经生成了ssrc
+            continue;
+        }
         //添加answer sdp的ssrc信息
         m.rtp_rtx_ssrc.emplace_back();
         auto &ssrc = m.rtp_rtx_ssrc.back();
@@ -668,6 +672,10 @@ void WebRtcTransportImp::createRtpChannel(const string &rid, uint32_t ssrc, Medi
     InfoL << "create rtp receiver of ssrc:" << ssrc << ", rid:" << rid << ", codec:" << track.plan_rtp->codec;
 }
 
+void WebRtcTransportImp::updateTicker() {
+    _alive_ticker.resetTime();
+}
+
 void WebRtcTransportImp::onRtp(const char *buf, size_t len, uint64_t stamp_ms) {
     _bytes_usage += len;
     _alive_ticker.resetTime();
diff --git a/webrtc/WebRtcTransport.h b/webrtc/WebRtcTransport.h
index 02c4cb0d..f5153e1f 100644
--- a/webrtc/WebRtcTransport.h
+++ b/webrtc/WebRtcTransport.h
@@ -189,6 +189,7 @@ protected:
     void onDestory() override;
     void onShutdown(const SockException &ex) override;
     virtual void onRecvRtp(MediaTrack &track, const string &rid, RtpPacket::Ptr rtp) = 0;
+    void updateTicker();
 
 private:
     SdpAttrCandidate::Ptr getIceCandidate() const;