<div dir="ltr">Also known as 2 B-channel Transfer or TBCT (should help your searching).</div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Mar 7, 2017 at 5:54 PM, Anthony Holloway <span dir="ltr"><<a href="mailto:avholloway+cisco-voip@gmail.com" target="_blank">avholloway+cisco-voip@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I'm not sure how often this gets configured out in the wild, but I do know that there are few different flavors of this feature, depending on your scenario. E.g., <a href="http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/media-path.html#concept_674530029296875008039300537109374" target="_blank">CUBE Media Anti-Tromboning</a><div><br></div><div>The one I'm interested in would involve a tie line to a legacy PBX, and I'm not married to the IP technology: SIP, H323, MGCP, whichever will get the job done.</div><div><br></div><div>CUCM ---IP---> VGW ---T1/PRI---> PBX</div><div><br></div><div>The call scenario I'd like to see if we can avoid is when a call is established from CUCM to the other PBX, and then a phone on the far side transfers the call to an IP Phone on the CUCM side, I'd like the PRI usage to drop to 0 trunks in use, instead of nailing up 2 trunks for the duration of that call.</div><div><br></div><div>I'm looking for your experience and feedback in configuring anti-tromboning in this scenario. One of the hardest parts in researching this, is knowing what terms to search for. I think I've narrowed down the terminology to QSIG Path Replacement, <a href="http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_5_1/ccmsys/accm-851-cm/a08procl.html#wp1156114" target="_blank">as described in the CUCM SRND</a>.</div><div><br></div><div>Though, without real-world working experience, it's hard to know if I'm right or not.</div><div><br></div><div>So, I know there's some good legacy telco knowledge out on this list. What do you know? Thanks!</div></div>
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