发送

{
"action":"SDP_OFFER",
"recipientClientId":"12345678",
"messagePayload":"base64",
"correlationId":"表示会话id，可用GUID生成字符串",
"earlyMedia":true,
"iceServerList":[
{"uris":["stun:stun1.l.google.com:19302"],"userName":"",
"password":"","ttl":0}]
}

接收

{
   "senderClientId":"87654321",
   "messageType":"SDP_OFFER",
   "messagePayload":"base64",
   "earlyMedia":true,
   "iceServerList":[
      {
         "uris":[
            "stun:stun1.l.google.com:19302"
         ],
         "userName":"",
         "password":"",
         "ttl":0
      }
   ],
   "statusResponse":{
      "correlationId":"",
      "errorType":"",
      "statusCode":"",
      "description":""
   }
}