diff --git a/taoyao-client-android/taoyao/media/src/main/java/com/acgist/taoyao/media/client/SessionClient.java b/taoyao-client-android/taoyao/media/src/main/java/com/acgist/taoyao/media/client/SessionClient.java
index f5059af..e090f22 100644
--- a/taoyao-client-android/taoyao/media/src/main/java/com/acgist/taoyao/media/client/SessionClient.java
+++ b/taoyao-client-android/taoyao/media/src/main/java/com/acgist/taoyao/media/client/SessionClient.java
@@ -35,7 +35,9 @@ import java.util.function.Consumer;
  * P2P终端
  * 使用安卓SDK + WebRTC实现P2P会话
  *
- * https://zhuanlan.zhihu.com/p/82446482
+ * 注意：
+ * 2. offer/answer/candidate枚举大小
+ * 1. candidate格式安卓和浏览器格式不同
  *
  * @author acgist
  */
@@ -56,10 +58,6 @@ public class SessionClient extends Client {
     private final boolean videoProduce;
     private final MediaProperties mediaProperties;
     private final WebrtcProperties webrtcProperties;
-    /**
-     * 是否已经提供本地媒体
-     */
-    private volatile boolean offerLocal;
     /**
      * 本地媒体
      */
@@ -168,10 +166,6 @@ public class SessionClient extends Client {
      * 提供媒体服务
      */
     public synchronized void offer() {
-        if(this.offerLocal) {
-            return;
-        }
-        this.offerLocal = true;
         final MediaConstraints mediaConstraints = this.mediaManager.buildMediaConstraints();
         this.peerConnection.createOffer(this.sdpObserver(
             "主动Offer",
@@ -179,9 +173,7 @@ public class SessionClient extends Client {
                 this.peerConnection.setLocalDescription(this.sdpObserver(
                     "主动OfferExchange",
                     null,
-                    () -> {
-                        this.exchangeSessionDescription(sessionDescription);
-                    }
+                    () -> this.exchangeSessionDescription(sessionDescription)
                 ), sessionDescription);
             },
             null
@@ -202,10 +194,7 @@ public class SessionClient extends Client {
                     this.peerConnection.setLocalDescription(this.sdpObserver(
                         "主动AnswerExchange",
                         null,
-                        () -> {
-                            this.exchangeSessionDescription(sessionDescription);
-                            this.offer();
-                        }
+                        () -> this.exchangeSessionDescription(sessionDescription)
                     ), sessionDescription);
                 },
                 null
@@ -221,15 +210,14 @@ public class SessionClient extends Client {
             "被动Answer",
             null,
             null
-//            () -> this.offer()
         ), new SessionDescription(sdpType, sdp));
     }
 
     private void candidate(Message message, Map<String, Object> body) {
         final Map<String, Object> candidate = MapUtils.get(body, "candidate");
-        final String  sdp           = MapUtils.get(candidate, "candidate");
-        final String  sdpMid        = MapUtils.get(candidate, "sdpMid");
-        final Integer sdpMLineIndex = MapUtils.getInteger(candidate, "sdpMLineIndex");
+        final String  sdp                   = MapUtils.get(candidate, "candidate");
+        final String  sdpMid                = MapUtils.get(candidate, "sdpMid");
+        final Integer sdpMLineIndex         = MapUtils.getInteger(candidate, "sdpMLineIndex");
         if(sdp == null || sdpMid == null || sdpMLineIndex == null) {
             Log.w(SessionClient.class.getSimpleName(), "无效媒体协商：" + body);
         } else {
diff --git a/taoyao-client-web/src/components/Taoyao.js b/taoyao-client-web/src/components/Taoyao.js
index d94e9ca..ceb1c1d 100644
--- a/taoyao-client-web/src/components/Taoyao.js
+++ b/taoyao-client-web/src/components/Taoyao.js
@@ -241,8 +241,6 @@ class Session {
   clientId;
   // 会话ID
   sessionId;
-  // 是否已经提供本地媒体
-  offerLocal;
   // 本地媒体流
   localStream;
   // 本地音频
@@ -266,7 +264,6 @@ class Session {
     this.closed     = false;
     this.clientId   = clientId;
     this.sessionId  = sessionId;
-    this.offerLocal = false;
   }
 
   async pause() {
@@ -2151,7 +2148,6 @@ class Taoyao extends RemoteClient {
     this.sessionClients.set(sessionId, session);
     await me.buildPeerConnection(session, sessionId);
     session.peerConnection.createOffer().then(async description => {
-      session.offerLocal = true;
       await session.peerConnection.setLocalDescription(description);
       me.push(
         protocol.buildMessage("session::exchange", {
@@ -2199,18 +2195,6 @@ class Taoyao extends RemoteClient {
             sessionId: sessionId
           })
         );
-        if(!session.offerLocal) {
-          session.peerConnection.createOffer().then(async description => {
-            await session.peerConnection.setLocalDescription(description);
-            me.push(
-              protocol.buildMessage("session::exchange", {
-                sdp      : description.sdp,
-                type     : description.type,
-                sessionId: sessionId
-              })
-            );
-          });
-        }
       });
     } else if (type === "answer") {
       await session.peerConnection.setRemoteDescription(new RTCSessionDescription(message.body));
diff --git a/taoyao-signal-server/taoyao-signal/src/main/java/com/acgist/taoyao/signal/protocol/session/SessionExchangeProtocol.java b/taoyao-signal-server/taoyao-signal/src/main/java/com/acgist/taoyao/signal/protocol/session/SessionExchangeProtocol.java
index f0c31e4..20e2580 100644
--- a/taoyao-signal-server/taoyao-signal/src/main/java/com/acgist/taoyao/signal/protocol/session/SessionExchangeProtocol.java
+++ b/taoyao-signal-server/taoyao-signal/src/main/java/com/acgist/taoyao/signal/protocol/session/SessionExchangeProtocol.java
@@ -17,9 +17,31 @@ import com.acgist.taoyao.signal.protocol.ProtocolSessionAdapter;
  */
 @Protocol
 @Description(
-    memo = "媒体交换协商：offer/answer/candidate",
+    memo = """
+        媒体交换协商：offer/answer/candidate
+        安卓需要注意：
+            1. 交换类型大小写
+            2. candidate内容默认名称sdp
+    """,
     body = """
     {
+        "sdp": "sdp"
+        "type": "offer",
+        "sessionId": "会话ID"
+    }
+    {
+        "sdp": "sdp"
+        "type": "answer",
+        "sessionId": "会话ID"
+    }
+    {
+        "type": "candidate",
+        "sessionId": "会话ID",
+        "candidate": {
+            "sdpMid": "sdpMid",
+            "candidate": "candidate信息",
+            "sdpMLineIndex":sdpMLineIndex 
+        }
     }
     """,
     flow = "终端->信令服务->终端"