fix regression in rtp stack trying to avoid broken clients who send the wrong…

fix regression in rtp stack trying to avoid broken clients who send the wrong payload type, we were eating the stun packets in jingle calls

src/switch_rtp.c

@@ -2808,7 +2808,8 @@ static int rtp_common_read(switch_rtp_t *rtp_session, switch_payload_t *payload_
 			goto end;
 		}
 
-		if (bytes && !switch_test_flag(rtp_session, SWITCH_RTP_FLAG_PROXY_MEDIA) && !switch_test_flag(rtp_session, SWITCH_RTP_FLAG_UDPTL) &&
+		if (bytes && rtp_session->recv_msg.header.version == 2 && 
+			!switch_test_flag(rtp_session, SWITCH_RTP_FLAG_PROXY_MEDIA) && !switch_test_flag(rtp_session, SWITCH_RTP_FLAG_UDPTL) &&
 			rtp_session->recv_msg.header.pt != 13 && 
 			rtp_session->recv_msg.header.pt != rtp_session->recv_te && 
 			(!rtp_session->cng_pt || rtp_session->recv_msg.header.pt != rtp_session->cng_pt) &&