Fix/audio issue kick conference (#878)

* rest call session does not handle for RE-INVITE

* fixed audio is bad after kicked from conference

* fix review comment

lib/session/call-session.js

@@ -2074,6 +2074,9 @@ Duration=${duration} `
     // When this call kicked out from conference, session need to replace endpoint
     // but this.ms might be undefined/null at this case.
     this.ms = this.ms || this.getMS();
+    // Destroy previous ep if it's still running.
+    if (this.ep?.connected) this.ep.destroy();
+
     this.ep = await this.ms.createEndpoint({remoteSdp: this.dlg.remote.sdp});
     this._configMsEndpoint();