Resync RTP session in case of timestamp jump

This will prevent the timestamp jump to occur between each call for DTX
if something goes wrong. It's handy as oRTP does not manage well
timestamp jump if it is not resynced.

Fixes: OS#1803
Change-Id: Iae5da832218dbd1ede7a9451102074f2a5eb66df
diff --git a/src/trau/osmo_ortp.c b/src/trau/osmo_ortp.c
index 6ce70d2..e3c6234 100644
--- a/src/trau/osmo_ortp.c
+++ b/src/trau/osmo_ortp.c
@@ -139,7 +139,8 @@
 	uint32_t ts = rtp_session_get_current_recv_ts(rs);
 
 	LOGP(DLMIB, LOGL_NOTICE,
-	     "osmo-ortp(%d): timestamp_jump, new TS %d\n", port, ts);
+	     "osmo-ortp(%d): timestamp_jump, new TS %d, resyncing\n", port, ts);
+	rtp_session_resync(rs);
 }