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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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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Like Matt, I'm also a bit confused on the use case for a proxy-specific timer. At the same time, though, I have to say that this can be a useful feature to have in case a situation were to arise where Asterisk sends out an INVITE, gets a provisional response (which kills timer B), and then never gets any further response. This would allow for the call to be torn down automatically in such a situation. In fact, I'm curious what a UAC is supposed to do in such a situation if it does not implement timer C.</pre>
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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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<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="margin-left: 2em; 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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<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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<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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<pre style="margin-left: 2em; 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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<a href="https://reviewboard.asterisk.org/r/3438/diff/1/?file=57236#file57236line31532" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int reload_config(enum channelreloadreason reason)</pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Use sscanf here instead of atoi. Like with the peer option, I think that if the value is less than 180, then it should be considered invalid.</pre>
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<a href="https://reviewboard.asterisk.org/r/3438/diff/1/?file=57238#file57238line583" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/configs/sip.conf.sample</a>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">;timert1=500 ; Default T1 timer</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">;timert1=500 ; Default T1 timer</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> ; Defaults to 500 ms or the measured round-trip</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> ; Defaults to 500 ms or the measured round-trip</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> ; time to a peer (qualify=yes).</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> ; time to a peer (qualify=yes).</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">;timerb=32000 ; Call setup timer. If a <span class="hl">provisio</span>nal response is not received</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">;timerb=32000 ; Call setup timer. If a <span class="hl">fi</span>nal response is not received</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> ; in this amount of time, the call will autocongest</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> ; in this amount of time, the call will autocongest</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> ; Defaults to 64*timert1</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> ; Defaults to 64*timert1</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">;timerc=420 ; Call setup timer. If a provisional response is not received</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>; during this time - the call will autocongest. Default 180 secs.</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>; or equal to 180.</pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Since the other timers are configured with milliseconds, I suggest configuring timer c in milliseconds as well.</pre>
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<p>- Mark Michelson</p>
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<p>On April 11th, 2014, 8:41 a.m. UTC, 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 April 11, 2014, 8:41 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">(412166)</span></li>
<li>/trunk/channels/sip/include/sip.h <span style="color: grey">(412166)</span></li>
<li>/trunk/channels/chan_sip.c <span style="color: grey">(412166)</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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