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<a href="https://reviewboard.asterisk.org/r/2470/diff/1/?file=36403#file36403line1942" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/main/bridging.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 bridge_channel_dtmf_stream(struct ast_bridge_channel *bridge_channel, const char *dtmf)</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><span class="cs">XXX</span><span class="cm"> These buffer sizes could use more consideration. Currently</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="cm"> * just numbers pulled out of thin air.</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></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="k">struct</span> <span class="n">blind_transfer_data</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; "></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="kt">char</span> <span class="n">exten</span><span class="p">[</span><span class="n">AST_MAX_EXTENSION</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; "></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="kt">char</span> <span class="n">context</span><span class="p">[</span><span class="n">AST_MAX_CONTEXT</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="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;">They don't look pulled from thin air.</pre>
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<a href="https://reviewboard.asterisk.org/r/2470/diff/1/?file=36403#file36403line4422" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/main/bridging.c</a>
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(Diff revision 1)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span>/* </span><span class="cs">XXX</span><span class="c"> the second parameter here is a channel to potentially put into autoservice.</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span> * We only would need to put the transferer into autoservice if this is called</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span> * from the transferer's thread that is servicing the channel. Would 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="c"><span class="tb"> </span> * ever happen?</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span> */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span>parking_exten = ast_get_parking_exten(exten, NULL, context);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span>if (parking_exten) {</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span><span class="tb"> </span>return ast_park_blind_xfer(bridge, transferer, parking_exten) == 0 ?</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>PARKING_SUCCESS : PARKING_FAILURE;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span>}</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;">No, this is never going to happen. The only reason we are even interested in the whole extension is so that we can originate a local channel to it if the bridge is a multiparty bridge. Aside from that, all we get out of this is the argument string on the extension and use it for bridge_move. I don't believe autoservice is ever going to be a factor in any of this.</pre>
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<a href="https://reviewboard.asterisk.org/r/2470/diff/1/?file=36404#file36404line3921" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/main/manager.c</a>
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(Diff revision 1)
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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></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>switch (ast_bridge_blind_transfer(chan, exten, context, NULL)) {</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>case AST_BRIDGE_TRANSFER_NOT_PERMITTED:</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>astman_send_error(s, m, "Transfer not permitted");</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>break;</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>case AST_BRIDGE_TRANSFER_INVALID:</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>astman_send_error(s, m, "Transfer invalid");</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>break;</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>case AST_BRIDGE_TRANSFER_FAIL:</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>astman_send_error(s, m, "Transfer failed");</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>break;</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>case AST_BRIDGE_TRANSFER_SUCCESS:</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>astman_send_ack(s, m, "Transfer succeeded");</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;">white space</pre>
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<p>- jrose</p>
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<p>On April 24th, 2013, 10:25 p.m. UTC, Mark Michelson wrote:</p>
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<div>Review request for Asterisk Developers, jrose and rmudgett.</div>
<div>By Mark Michelson.</div>
<p style="color: grey;"><i>Updated April 24, 2013, 10:25 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-21335">ASTERISK-21335</a>
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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;">This adds a new API call to bridging.h called ast_bridge_blind_transfer(). It is intended to be used by channel drivers and other entities that receive external notifications to perform a blind transfer.
The idea here is to provide the transferer channel, and the target extension and context. Given this information, all parties bridged to the transferer will be transferred to the given location. In the case where the transferer is bridged to multiple peers, the entire bridge is transferred by starting a local channel and swapping the transferer and local channel. In the case where the transferer is bridged to a single party, then that one party is redirected to the given destination.
Another parameter that the blind transfer code can be given is a framehook. This is useful for cases where the caller of ast_bridge_blind_transfer() wishes to be able to monitor the progress of the new outbound call. The framehook is attached either to the newly-created local channel (in the case of transferring multiple bridged peers) or to the existing transferee channel (in the case of transferring a single channel).
During implementation discussions, it was noticed that there were some special flags needed for bridges. One such flag always prohibits transfers from occurring on a bridge. This is useful for holding bridges, parking bridges, and other bridges where the participant is not necessarily aware that he is in a bridge. Another flag states that no matter the number of participants in the bridge, the entire bridge should be transferred rather than only transferring a single participant. This is used for bridges that are intended to always be multi-party, such as the bridge created by app_confbridge. I have applied these flags in a few places. Please let me know if there are other bridges where these flags should be applied.
Unfinished business:
* There is a large chunk of code that is commented out with regards to parking. The API that this section relies on is currently a work in progress in /team/jrose/bridge_projects/. Once that code has been merged, then the parking-relevant code can be tested.
* There are likely some small details that I have not addressed. For instance, I do not set any channel variables at all during a blind transfer. It may be desirable to set a BLINDTRANSFER or other variables on channels. Please let me know if there are items that I need to add here.
* This review is intended only to implement blind transfers, but you will notice in bridging.h an ast_bridge_attended_transfer() function and a stub for it in bridging.c. This is simply a placeholder for now, but it will be implemented soon.</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;">To test this, I created an AMI action called BlindTransfer. The action takes the transferer channel, context, and extension as an argument. With this action, I was able to test both a one-to-one blind transfer, as well as a transfer of a confbridge. They both worked. I wrote this AMI action as a way of testing this API, but I also documented it in case it is decided that this would be a useful action to have permanently.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/team/group/bridge_construction/apps/app_bridgewait.c <span style="color: grey">(386463)</span></li>
<li>/team/group/bridge_construction/apps/app_confbridge.c <span style="color: grey">(386463)</span></li>
<li>/team/group/bridge_construction/include/asterisk/bridging.h <span style="color: grey">(386463)</span></li>
<li>/team/group/bridge_construction/include/asterisk/bridging_features.h <span style="color: grey">(386463)</span></li>
<li>/team/group/bridge_construction/include/asterisk/framehook.h <span style="color: grey">(386463)</span></li>
<li>/team/group/bridge_construction/main/bridging.c <span style="color: grey">(386463)</span></li>
<li>/team/group/bridge_construction/main/manager.c <span style="color: grey">(386463)</span></li>
<li>/team/group/bridge_construction/main/pbx.c <span style="color: grey">(386463)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2470/diff/" style="margin-left: 3em;">View Diff</a></p>
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