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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3438/">https://reviewboard.asterisk.org/r/3438/</a>
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<p style="margin-top: 0;">On April 23rd, 2014, 9:13 a.m. CDT, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/3438/diff/1/?file=57236#file57236line22992" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void handle_response_invite(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, uint32_t seqno)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew"> <span class="tb"> </span></span>} else {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew"> <span class="tb"> </span></span><span class="tb"> </span>if (p->invitestate == INV_PROCEEDING) {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew"> <span class="tb"> </span></span><span class="tb"> </span><span class="tb"> </span>if (p->timercid == -1) {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew"> <span class="tb"> </span></span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>/* Trigger timer C */</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew"> <span class="tb"> </span></span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>AST_SCHED_REPLACE_UNREF(p->timercid, sched, p->timer_c * 1000, dialog_proceeding_timeout, p,</pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">RFC 3261 section 16.7, bullet point 2 states:
"...if the response is a provisional response with status codes 101 to 199 inclusive (i.e., anything but 100), the proxy MUST reset timer C..."
This else case needs to be modified to not execute if the response is a 100.</pre>
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<p>On May 21st, 2014, 7:53 a.m. CDT, <b>Matt Jordan</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I think I agree with Mark here as well, and the RFC makes sense when it says to not reset Timer C on a 100. There's no real need to reset Timer C in that case, as that typically comes directly on the heels of the transmitted INVITE request.</pre>
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<p>On May 21st, 2014, 7:54 a.m. CDT, <b>Olle E Johansson</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I am not sure. What's the use case for not doing it on 100. I understand why a proxy should not react to a 100, since it's hop by hop, but for a UA I don't see the point of your comment.</pre>
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<p>On May 21st, 2014, 9:21 a.m. CDT, <b>Matt Jordan</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I would guess it is for two reasons:
(1) Timer C is started when the INVITE request is first processed. A 100 Trying received from who you just sent the INVITE request to is extremely likely to happen very quickly, since the UAS should be sending the 100 Trying on immediately receiving the INVITE request. Resetting the timer on the 100 Trying doesn't really offset the timer by much.
(2) More specifically, this probably relates to stateful proxies not forwarding 100 Trying messages. Since we aren't a proxy, that's probably of less impact in this case.
I'd bypass resetting the timer on a 100 for two reasons:
(1) It doesn't add much value to reset the timer in the first place on a 100
(2) It precludes (yet another) "you don't follow the RFC" bug report :-)</pre>
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<p>On May 21st, 2014, 9:33 a.m. CDT, <b>Olle E Johansson</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This doesn't make sense for a UA. We should reset it for any responses. By implementing this timer and calling it Timer C and not AstTimer Q we break the RFC any way. ;-)</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Barring a strong technical reason for not resetting the timer on a 100 - which I don't have, other than "the RFC says not to" - I'm okay with that. If someone files that issue, I suppose I can always reply with "patches welcome" :-)</pre>
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<p>- Matt</p>
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<p>On May 16th, 2014, 7:32 a.m. CDT, Olle E Johansson wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Olle E Johansson.</div>
<p style="color: grey;"><i>Updated May 16, 2014, 7:32 a.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">SIP Timer C is defined for proxys that forward messages. In some ways, we forward calls. It is activated when we receive a 100 trying and wait for any other message. If that's not received, timer C triggers and cancels the call attempt.
This is required in an interoperability test I'm working with.
Red dots will be handled in the way they deserve.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Passed interoperability testing with funky test tool.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/configs/sip.conf.sample <span style="color: grey">(414046)</span></li>
<li>/trunk/channels/sip/include/sip.h <span style="color: grey">(414046)</span></li>
<li>/trunk/channels/chan_sip.c <span style="color: grey">(414046)</span></li>
<li>/trunk/CHANGES <span style="color: grey">(414046)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3438/diff/" style="margin-left: 3em;">View Diff</a></p>
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