From f06302755a94cd117dc1d67d495130ad82798199 Mon Sep 17 00:00:00 2001
From: Terry Wilson <twilson@digium.com>
Date: Fri, 4 Jun 2010 03:11:31 +0000
Subject: [PATCH] Send an ACK for every final response received for an INVITE
From issue ABE-2247. RFC 3261 compliance for sections 13.2.24 and 17.1.1.2.
Review: https://reviewboard.asterisk.org/r/692/
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@267863 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
channels/chan_sip.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 8fb16b4062..0d45bb2349 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -18774,6 +18774,11 @@ static void handle_response(struct sip_pvt *p, int resp, const char *rest, struc
}
if (ack_res == FALSE) {
+ /* RFC 3261 13.2.2.4 and 17.1.1.2 - We must re-send ACKs to re-transmitted final responses */
+ if (sipmethod == SIP_INVITE && resp >= 200) {
+ transmit_request(p, SIP_ACK, seqno, XMIT_UNRELIABLE, resp < 300 ? TRUE: FALSE);
+ }
+
append_history(p, "Ignore", "Ignoring this retransmit\n");
return;
}
--
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