FS-7500: better version of last commit

src/switch_rtp.c

@@ -7065,7 +7065,11 @@ SWITCH_DECLARE(int) switch_rtp_write_frame(switch_rtp_t *rtp_session, switch_fra
 			send_msg->header.version = 2;
 			send_msg->header.m = frame->m;
 			send_msg->header.ts = htonl(frame->timestamp);
-			send_msg->header.ssrc = htonl(frame->ssrc);
+			if (frame->ssrc) {
+				send_msg->header.ssrc = htonl(frame->ssrc);
+			} else {
+				send_msg->header.ssrc = htonl(rtp_session->ssrc);
+			}
 		}
 
 	} else {