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<a href="https://reviewboard.asterisk.org/r/3485/diff/1/?file=57941#file57941line897" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/include/asterisk/bridge.h</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; ">enum ast_transfer_result {</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="cm">/*! The transfer operation succeeded, but the call was parked. Note that this</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * value will always be published to stasis as AST_BRIDGE_TRANSFER_SUCCESS.</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * This enum value is used for return values only. Keep it at the bottom of</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * the list. */</span></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="n">AST_BRIDGE_TRANSFER_SUCCESS_PARKED</span><span class="p">,</span></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 not sure I like this change.
Why is a blind transfer to parking not just a blind transfer success? The caller of ast_bridge_transfer_blind doesn't really care whether or not the channel ended up in Park or Limbo or Purgatory - so long as something accepted the channel, it's happy.
I'd lose this enum value, which reduces the scope of this change substantially.</pre>
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<a href="https://reviewboard.asterisk.org/r/3485/diff/1/?file=57942#file57942line4109" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/main/bridge.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; ">enum ast_transfer_result ast_bridge_transfer_blind(int is_external,</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">transfer_result</span> <span class="o">==</span> <span class="n">AST_BRIDGE_TRANSFER_SUCCESS</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">transfer_result</span> <span class="o">==</span> <span class="n">AST_BRIDGE_TRANSFER_SUCCESS</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">goto</span> <span class="n">publish</span><span class="p">;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">publish_blind_transfer</span><span class="p">(</span><span class="n">is_external</span><span class="p">,</span> <span class="n">transfer_result</span><span class="p">,</span> <span class="n">transferer</span><span class="p">,</span> <span class="n">bridge</span><span class="p">,</span> <span class="n">context</span><span class="p">,</span> <span class="n">exten</span><span class="p">);</span></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="k">return</span> <span class="n">AST_BRIDGE_TRANSFER_SUCCESS_PARKED</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></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;">Just return AST_BRIDGE_TRANSFER_SUCCESS here.</pre>
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<a href="https://reviewboard.asterisk.org/r/3485/diff/1/?file=57945#file57945line441" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/res/res_pjsip_refer.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 int refer_attended(void *data)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">case</span> <span class="n">AST_BRIDGE_TRANSFER_SUCCESS</span>:</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">case</span> <span class="n">AST_BRIDGE_TRANSFER_SUCCESS</span>:</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">response</span> <span class="o">=</span> <span class="mi">200</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">response</span> <span class="o">=</span> <span class="mi">200</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">ast_sip_session_defer_termination</span><span class="p">(</span><span class="n">attended</span><span class="o">-></span><span class="n">transferer</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">ast_sip_session_defer_termination</span><span class="p">(</span><span class="n">attended</span><span class="o">-></span><span class="n">transferer</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">break</span><span class="p">;</span></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="k">case</span> <span class="n">AST_BRIDGE_TRANSFER_SUCCESS_PARKED</span>:</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></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="cm">/* This should never happen with attended transfers */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></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="n">response</span> <span class="o">=</span> <span class="mi">200</span><span class="p">;</span></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="k">break</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></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;">Why would we defer termination on a bridge transfer success, but not for parking?</pre>
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<a href="https://reviewboard.asterisk.org/r/3485/diff/1/?file=57945#file57945line898" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/res/res_pjsip_refer.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int refer_incoming_refer_request(struct ast_sip_session *session, struct pjsip_rx_data *rdata)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">response</span> <span class="o">!=</span> <span class="mi">200</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">response</span> <span class="o">!=</span> <span class="mi">200</span><span class="hl"> </span><span class="o"><span class="hl">||</span></span><span class="hl"> </span><span class="n"><span class="hl">parked</span></span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="cm">/* Since this failed we can send a final NOTIFY now and terminate the subscription */</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="cm">/* Since this <span class="hl">either </span>failed<span class="hl"> or was parked,</span> we can send a final NOTIFY now and terminate the subscription */</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">struct</span> <span class="n">refer_progress_notification</span> <span class="o">*</span><span class="n">notification</span> <span class="o">=</span> <span class="n">refer_progress_notification_alloc</span><span class="p">(</span><span class="n">progress</span><span class="p">,</span> <span class="n">response</span><span class="p">,</span> <span class="n">PJSIP_EVSUB_STATE_TERMINATED</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">struct</span> <span class="n">refer_progress_notification</span> <span class="o">*</span><span class="n">notification</span> <span class="o">=</span> <span class="n">refer_progress_notification_alloc</span><span class="p">(</span><span class="n">progress</span><span class="p">,</span> <span class="n">response</span><span class="p">,</span> <span class="n">PJSIP_EVSUB_STATE_TERMINATED</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">notification</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">notification</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" 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="cm">/* The refer_progress_notify function will call ao2_cleanup on this for us */</span></pre></td>
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<td bgcolor="#ffffff" 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="cm">/* The refer_progress_notify function will call ao2_cleanup on this for us */</span></pre></td>
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<td bgcolor="#ffffff" 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="n">refer_progress_notify</span><span class="p">(</span><span class="n">notification</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" 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="n">refer_progress_notify</span><span class="p">(</span><span class="n">notification</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></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;">This feels like the wrong way to solve this problem. Having a 'parked' variable bleed up into this handling feels like we've got a design flaw in how we're handling parking.
refer_progress_bridge *should* be detecting that the channel entered into a holding bridge. That should be sending the 200 notification. If that isn't happening, then there is some other bug here that this solution is masking.
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<p>- Matt Jordan</p>
<br />
<p>On April 25th, 2014, 5:48 p.m. CDT, Jonathan Rose wrote:</p>
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<div>Review request for Asterisk Developers, Matt Jordan and Mark Michelson.</div>
<div>By Jonathan Rose.</div>
<p style="color: grey;"><i>Updated April 25, 2014, 5:48 p.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;">If a PJSIP endpoint attempts to blind transfer to a parking extension, there is an override to the normal transfer logic that can make things act a little weird. We noticed that this would leave various phones hanging on transfer screens without progressing. When the transfer was considered successful, PJSIP deferred the actual action of sending the 200 notify and the actual trigger for that happening never occurs when the transfer is to a parking extension.
In order to handle this, the bridge function that handles blind transfers now returns a different value if a call was parked and if the channel driver needs to react differently in this case, it can. In the case of PJSIP, we respond to transfers to park by immediately sending the notify with 200 OK sip frag instead of deferring the action.</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;">Before patch:
* Blind transfer on Polycom SPIP: Phone is on the blind transfer screen until it either manually hangs up or 60 seconds pass and Asterisk terminates the session.
After the patch:
* Blind transfer on Polycom SPIP: Phone immediately leaves the blind transfer screen and goes back to idle mode.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/12/res/res_pjsip_refer.c <span style="color: grey">(412824)</span></li>
<li>/branches/12/main/manager.c <span style="color: grey">(412824)</span></li>
<li>/branches/12/main/bridge_basic.c <span style="color: grey">(412824)</span></li>
<li>/branches/12/main/bridge.c <span style="color: grey">(412824)</span></li>
<li>/branches/12/include/asterisk/bridge.h <span style="color: grey">(412824)</span></li>
<li>/branches/12/channels/chan_unistim.c <span style="color: grey">(412824)</span></li>
<li>/branches/12/channels/chan_skinny.c <span style="color: grey">(412824)</span></li>
<li>/branches/12/channels/chan_sip.c <span style="color: grey">(412824)</span></li>
<li>/branches/12/channels/chan_oss.c <span style="color: grey">(412824)</span></li>
<li>/branches/12/channels/chan_iax2.c <span style="color: grey">(412824)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3485/diff/" style="margin-left: 3em;">View Diff</a></p>
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