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chan_sip: Do not increment the SDP version between 183 and 200 responses.

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Bumping the SDP version number can cause interoperability problems
since receivers of the responses will expect that a 200 SDP will
be identical to a previous 183 SDP.

(closes issue ASTERISK-21204)
reported by NITESH BANSAL

Patches:
	dont-increment-session-version-in-2xx-after-183.patch uploaded by NITESH BANSAL (License #6418)



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@400906 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Michelson
2013-10-14 21:32:11 +00:00
parent 02379cf262
commit 27f6318afb
1 changed files with 6 additions and 1 deletions
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7
channels/chan_sip.c
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@@ -6879,6 +6879,7 @@ static int sip_answer(struct ast_channel *ast)
{
int res = 0;
struct sip_pvt *p = ast->tech_pvt;
int oldsdp = FALSE;
if (!p) {
ast_debug(1, "Asked to answer channel %s without tech pvt; ignoring\n",
@@ -6889,10 +6890,14 @@ static int sip_answer(struct ast_channel *ast)
if (ast->_state != AST_STATE_UP) {
try_suggested_sip_codec(p);
if (ast_test_flag(&p->flags[0], SIP_PROGRESS_SENT)) {
oldsdp = TRUE;
}
ast_setstate(ast, AST_STATE_UP);
ast_debug(1, "SIP answering channel: %s\n", ast->name);
ast_rtp_instance_update_source(p->rtp);
res = transmit_response_with_sdp(p, "200 OK", &p->initreq, XMIT_CRITICAL, FALSE, TRUE);
res = transmit_response_with_sdp(p, "200 OK", &p->initreq, XMIT_CRITICAL, oldsdp, TRUE);
ast_set_flag(&p->flags[1], SIP_PAGE2_DIALOG_ESTABLISHED);
}
sip_pvt_unlock(p);