[Asterisk-code-review] RTP: need to reset DTMF last seqno/timestamp on voice packet... (asterisk[13])

[Alexei Gradinari]

Alexei Gradinari has uploaded this change for review. ( https://gerrit.asterisk.org/10623


Change subject: RTP: need to reset DTMF last seqno/timestamp on voice packet with marker bit
......................................................................

RTP: need to reset DTMF last seqno/timestamp on voice packet with marker bit

The marker bit set on the voice packet indicates the start
of a new stream and a new time stamp.
Need to reset the DTMF last sequence number and the timestamp
of the last END packet.

If the new time stamp is lower then the timestamp of the last DTMF END packet
the asterisk drops all DTMF frames as out of order.

This bug was caught using Cisco ip-phone SPA50X and codec g722.
On SIP session update the SPA50X resets stream indicating it with market bit
and a new timestamp is twice smaller then the previous.

ASTERISK-28162 #close

Change-Id: If9c5742158fa836ad549713a9814d46a5d2b1620
---
M res/res_rtp_asterisk.c
1 file changed, 10 insertions(+), 0 deletions(-)



  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/23/10623/1

diff --git a/res/res_rtp_asterisk.c b/res/res_rtp_asterisk.c
index 7b006ce..972058e 100644
--- a/res/res_rtp_asterisk.c
+++ b/res/res_rtp_asterisk.c
@@ -5725,6 +5725,16 @@
 	switch (ast_format_get_type(rtp->f.subclass.format)) {
 	case AST_MEDIA_TYPE_AUDIO:
 		rtp->f.frametype = AST_FRAME_VOICE;
+
+		/* The marker bit set on the voice packet indicates the start
+		 * of a new stream and a new time stamp. Need to reset the DTMF
+		 * last sequence number and the timestamp of the last END packet.
+		 */
+		if (mark) {
+			rtp->last_seqno = 0;
+			rtp->last_end_timestamp = 0;
+		}
+
 		break;
 	case AST_MEDIA_TYPE_VIDEO:
 		rtp->f.frametype = AST_FRAME_VIDEO;

-- 
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Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-MessageType: newchange
Gerrit-Change-Id: If9c5742158fa836ad549713a9814d46a5d2b1620
Gerrit-Change-Number: 10623
Gerrit-PatchSet: 1
Gerrit-Owner: Alexei Gradinari <alex2grad at gmail.com>
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