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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#file57236line30787" 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 struct sip_peer *build_peer(const char *name, struct ast_variable *v, struct ast_variable *alt, int realtime, int devstate_only)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>} else if (!strcasecmp(v->name, "timerc")) {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>if ((sscanf(v->value, "%30d", &peer->timer_c) != 1) || (peer->timer_c > 100)) {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>ast_log(LOG_WARNING, "'%s' is not a valid Timer C time at line %d (above 100, default 180 s). Using configured default %d.\n", v->value, v->lineno, global_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="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>peer->timer_c = global_timer_c;</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;">I'm a bit confused by this. If the configured timerc value is greater than 100 seconds, then that is considered invalid and the default of 180 seconds is used instead.
RFC 3261 Section 16.6, bullet point 11 states that timer C MUST be larger than 3 minutes. I would expect, then, that if the configured value were less than 180 seconds, that is when you would consider the configuration to be invalid and go with the default value of 180 seconds.</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;">Hey Olle - I took a look at RFC 3261 to see what Mark was alluding to here, and I think he is right - the minimum shouldn't be less than 3 minutes:
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11. Set timer C
In order to handle the case where an INVITE request never
generates a final response, the TU uses a timer which is called
timer C. Timer C MUST be set for each client transaction when
an INVITE request is proxied. The timer MUST be larger than 3
minutes. Section 16.7 bullet 2 discusses how this timer is
updated with provisional responses, and Section 16.8 discusses
processing when it fires.
{quote}
Is there a reason why we wouldn't go with a default value of 180 seconds, per the RFC?</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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