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<td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 9px"><a href="https://wiki.asterisk.org/wiki/display/~mmichelson?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_99ed0aa29d6f204db4785296f8170422" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<table class="content-excerpt-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 1px">
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <p class="diff-context-placeholder" style="margin: 10px 0 0 0; margin-top: 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">Let's imagine a scenario where Alice places a call to Bob, and then Bob performs an attended transfer to Carol. In this scenario, Alice is registered to Asterisk instance A (asterisk_a.com), and Bob is registered to <span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk instance </span><span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">Server </span>B (<span class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">asterisk</span><span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">server</span>_b.com)<span class="diff-html-added" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">, a non-Asterisk PBX</span>. The key to this scenario is that Asterisk A has been explicitly configured to be able to call Bob directly, despite the fact that Bob does not register to Asterisk A.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">As you can see, Bob has simultaneous calls through two separate <span class="diff-html-removed" id="removed-diff-2" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk </span>servers. Now when Bob performs the attended transfer, what happens? Bob will send a SIP REFER request to either Asterisk A or <span class="diff-html-removed" id="removed-diff-3" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk </span><span class="diff-html-added" id="added-diff-3" style="font-size: 100%; background-color: #ddfade;">Server </span>B to get the two <span class="diff-html-removed" id="removed-diff-4" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk instances </span><span class="diff-html-added" id="added-diff-4" style="font-size: 100%; background-color: #ddfade;">SIP servers </span>in contact with each other. Most phones will send the REFER to Asterisk A since it is the original leg of the call, so that is what we will do in our scenario. The REFER request has a Refer-To header that specifies details of the transfer. The Refer-To header for this particular transfer looks like the following:</p>
<table class="diff-macro diff-block-target" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333">
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB/5635/60fd2eb45debbf4ede2b669f4c9b96b4ce40a937.48/_/images/icons/macrobrowser/dropdown/noformat.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>No Format</th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">Refer-To: <sip:<span class="diff-html-removed" id="removed-diff-5" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">carol@asterisk</span><span class="diff-html-added" id="added-diff-5" style="font-size: 100%; background-color: #ddfade;">carol@server</span>_b.com?Replaces=ABCDE%3Bto-tag%3DBtoBobfrom-tag%3DBobtoB></pre> </td>
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</table> <p class="diff-block-context" style="margin: 10px 0 0 0">That's a bit verbose. So let's break it down a little bit. First, there is a SIP URI:</p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB/5635/60fd2eb45debbf4ede2b669f4c9b96b4ce40a937.48/_/images/icons/macrobrowser/dropdown/noformat.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>No Format</th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">sip:<span class="diff-html-removed" id="removed-diff-6" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">carol@asterisk</span><span class="diff-html-added" id="added-diff-6" style="font-size: 100%; background-color: #ddfade;">carol@server</span>_b.com</pre> </td>
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</table> <p class="diff-block-context" style="margin: 10px 0 0 0">Next, there is a Replaces URI header. There are some URL-escaped character sequences in there. If we decode them, we get the following:</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">However, in this case, the dialog referred to by Bob's Replaces header is not on Asterisk A. It is on <span class="diff-html-removed" id="removed-diff-7" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk </span><span class="diff-html-added" id="added-diff-7" style="font-size: 100%; background-color: #ddfade;">Server </span>B. So Asterisk A cannot perform a local attended transfer. This is where a remote attended transfer is required.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">In the scenario above, when Asterisk A receives the REFER request from Bob, Asterisk A should respond by sending an INVITE to <code style="font-family: monospace">sip:<span class="diff-html-removed" id="removed-diff-8" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">carol@asterisk</span><span class="diff-html-added" id="added-diff-8" style="font-size: 100%; background-color: #ddfade;">carol@server</span>_b.com</code> and add</p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB/5635/60fd2eb45debbf4ede2b669f4c9b96b4ce40a937.48/_/images/icons/macrobrowser/dropdown/noformat.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>No Format</th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">Replaces: ABCDE;to-tag=BtoBob;from-tag=BobtoB</pre> </td>
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</table> <p class="diff-block-target" style="margin: 10px 0 0 0">When <span class="diff-html-removed" id="removed-diff-9" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk </span><span class="diff-html-added" id="added-diff-9" style="font-size: 100%; background-color: #ddfade;">Server </span>B receives this INVITE, it will essentially swap this new call in for the call referenced by the Replaces header. By doing this, the final picture looks something like the following:</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">Asterisk will rarely ever directly place outbound calls without going through the dialplan. When Asterisk A receives the REFER request from Bob, Asterisk does not immediately send an INVITE with Replaces header to <span class="diff-html-removed" id="removed-diff-10" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk </span><span class="diff-html-added" id="added-diff-10" style="font-size: 100%; background-color: #ddfade;">Server </span>B. Instead, Asterisk A looks for a specifically-named extension called "external_replaces". Asterisk searches for this extension in the context specified by the <code style="font-family: monospace">TRANSFER_CONTEXT</code> channel variable if present on Bob's channel, or in <span class="diff-html-removed" id="removed-diff-11" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">the </span>Bob's endpoint's configured context otherwise. Once in the dialplan, it is the job of the dialplan writer to determine whether to complete the transfer or not.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">Let's examine that <code style="font-family: monospace">Dial()</code> more closely. First, we're dialing using PJSIP, which is pretty obvious. Next, we have the endpoint name. The endpoint name could be any configured endpoint you want to use to make this call. Remember that endpoint settings are things such as what codecs to use, what user name to place in the from header, etc. By default, if you just dial <code style="font-family: monospace">PJSIP/some_endpoint</code>, Asterisk looks at some_endpoint's configured <code style="font-family: monospace">aors</code> to determine what location to send the outgoing call to. However, you can override this default behavior and specify a URI to send the call to instead. This is what is being done in this <code style="font-family: monospace">Dial()</code> statement. We're dialing using settings for an endpoint called "default_outgoing", presumably used as a default endpoint for outgoing calls. We're sending the call out to the URI specified by <code style="font-family: monospace">SIPREFERTOHDR</code> though. Using the scenario on this page, the <code style="font-family: monospace">Dial()</code> command would route the call to <code style="font-family: monospace">sip:<span class="diff-html-removed" id="removed-diff-12" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">carol@asterisk</span><span class="diff-html-added" id="added-diff-11" style="font-size: 100%; background-color: #ddfade;">carol@server</span>_b</code>.</p> <h1 id="res_pjsipRemoteAttendedTransfers-AvoidingRemoteAttendedTransfers" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">Avoiding Remote Attended Transfers</h1> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">Another way is to configure your Asterisk server to only call phones that are directly registered to it and trusted SIP servers. In the scenario we have been inspecting, the remote attended transfer could have been avoided by having Asterisk A call Bob through <span class="diff-html-removed" id="removed-diff-13" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk </span><span class="diff-html-added" id="added-diff-12" style="font-size: 100%; background-color: #ddfade;">Server </span>B instead of dialing Bob directly. By receiving the initial call through <span class="diff-html-removed" id="removed-diff-14" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk </span><span class="diff-html-added" id="added-diff-13" style="font-size: 100%; background-color: #ddfade;">Server </span>B, Bob will send his REFER request to <span class="diff-html-removed" id="removed-diff-15" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Asterisk </span><span class="diff-html-added" id="added-diff-14" style="font-size: 100%; background-color: #ddfade;">Server </span>B, who <span class="diff-html-removed" id="removed-diff-16" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">is </span><span class="diff-html-added" id="added-diff-15" style="font-size: 100%; background-color: #ddfade;">being </span>aware of all necessary dialogs<span class="diff-html-removed" id="removed-diff-17" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">. Asterisk B will </span><span class="diff-html-added" id="added-diff-16" style="font-size: 100%; background-color: #ddfade;">, may </span>be able to perform a local attended transfer <span class="diff-html-removed" id="removed-diff-18" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">to Carol as a result</span><span class="diff-html-added" id="added-diff-17" style="font-size: 100%; background-color: #ddfade;">(assuming it can do the same optimization as Asterisk)</span>. Configuring Asterisk this way is not necessarily guaranteed to prevent all remote attended transfer attempts, but it will help to lessen them.</p> </td>
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