fix regression with proxy_packet flag

src/switch_rtp.c

@@ -4426,7 +4426,8 @@ SWITCH_DECLARE(int) switch_rtp_write_frame(switch_rtp_t *rtp_session, switch_fra
 		return -1;
 	}
 	
-	if (switch_test_flag(rtp_session, SWITCH_RTP_FLAG_PROXY_MEDIA) || switch_test_flag(rtp_session, SWITCH_RTP_FLAG_UDPTL)) {
+	if (switch_test_flag(frame, SFF_PROXY_PACKET) || switch_test_flag(frame, SFF_UDPTL_PACKET) ||
+		switch_test_flag(rtp_session, SWITCH_RTP_FLAG_PROXY_MEDIA) || switch_test_flag(rtp_session, SWITCH_RTP_FLAG_UDPTL)) {
 		switch_size_t bytes;
 		//char bufa[30];