iuup: Increment RTP hdr seqnr even if Tx over UDP fails

This way holes can be detected. In practice it's not much important
since it would be really strange that UDP fails for a while and then it
starts working out of the blue...

Related: SYS#6907
Change-Id: I8095f3505c859650c0b83abce405067bef745975
---
M src/libosmo-mgcp/mgcp_iuup.c
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/libosmo-mgcp/mgcp_iuup.c b/src/libosmo-mgcp/mgcp_iuup.c
index d6f164d..4832ddc 100644
--- a/src/libosmo-mgcp/mgcp_iuup.c
+++ b/src/libosmo-mgcp/mgcp_iuup.c
@@ -505,6 +505,7 @@
 	hdr->timestamp = osmo_htonl(mgcp_get_current_ts(rtp_end->codec->rate));
 	hdr->sequence = osmo_htons(rtp_state->alt_rtp_tx_sequence);
 	hdr->ssrc = rtp_state->alt_rtp_tx_ssrc;
+	rtp_state->alt_rtp_tx_sequence++;
 
 	LOGPENDP(endp, DRTP, LOGL_DEBUG,
 		 "process/send IuUP to %s %s rtp_port:%u rtcp_port:%u\n",
@@ -521,7 +522,6 @@
 
 	rtpconn_rate_ctr_add(conn_dst, endp, RTP_PACKETS_TX_CTR, 1);
 	rtpconn_rate_ctr_add(conn_dst, endp, RTP_OCTETS_TX_CTR, buflen);
-	rtp_state->alt_rtp_tx_sequence++;
 
 	return 0;
 }

