ssrc规则修改

GB28181Session.js

@@ -739,10 +739,10 @@ class NodeSipSession {
 
             //ssrc is here  -- by ntv wangjian
             //let ssrc = "0" + channelId.substring(16, 20) + channelId.substring(3, 8);
-            let ssed = channelId.substring(13, 20);
+            let ssed = channelId.substring(13);
             let ised = '' + (parseInt(ssed)*13+10000);
-            let ssrc = "1" + ssed + ised.substring(3,5);
-
+            let ssrc = "1" + ssed + ised.substring(ised.length-2);
+ 
             let host = rhost || "127.0.0.1";
 
             let port = rport || 9200;