<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1489074869247_2789"><span id="yui_3_16_0_ym19_1_1489074869247_2788">I found the link. it has what needs to be changed in the PBX and what is needed on the gateway and in the gateway configs on CUCM.</span></div><div><span><br></span></div><div dir="ltr"><span><a href="http://www.cisco.com/c/en/us/solutions/collateral/enterprise/interoperability-portal/712433.pdf">http://www.cisco.com/c/en/us/solutions/collateral/enterprise/interoperability-portal/712433.pdf</a></span></div><div id="yui_3_16_0_ym19_1_1489074869247_2802" dir="ltr"><span><br></span></div><div dir="ltr"><span><br></span></div><div id="yui_3_16_0_ym19_1_1489074869247_2803" dir="ltr"><span>Carlo</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font face="Arial" size="2"> On Thursday, March 9, 2017 7:43 AM, Carlo Calabrese via cisco-voip <cisco-voip@puck.nether.net> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv1372323076"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div id="yiv1372323076yui_3_16_0_ym19_1_1489073442323_3241"><span id="yiv1372323076yui_3_16_0_ym19_1_1489073442323_3264">QSIG with MGCP. I use this to connect to a few Nortel PBX's. The main reason was to get rid of Meridian Mail and put it on Unity. Started this bad in the 4.2 days. When the call transfers out it will release the channels and the PRI is no longer in the call.</span></div><div id="yiv1372323076yui_3_16_0_ym19_1_1489073442323_3295"><span>Easy to set up. just a couple of configs on the gateway and a few options changes on the PBX. </span></div><div dir="ltr"><span>Cisco has a document on it somewhere. I am trying to find it on my PC, but that was 10 years ago.</span></div> <div class="yiv1372323076qtdSeparateBR"><br clear="none"><br clear="none"></div><div class="yiv1372323076yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div class="yiv1372323076yqt6348673073" id="yiv1372323076yqtfd74746"><div dir="ltr"><font face="Arial" size="2"> On Tuesday, March 7, 2017 3:25 PM, Brian Meade <bmeade90@vt.edu> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv1372323076y_msg_container"><div id="yiv1372323076"><div><div dir="ltr">Also known as 2 B-channel Transfer or TBCT (should help your searching).</div><div class="yiv1372323076gmail_extra"><br clear="none"><div class="yiv1372323076gmail_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" rel="nofollow" shape="rect" ymailto="mailto:avholloway+cisco-voip@gmail.com">avholloway+cisco-voip@gmail.com</a>></span> wrote:<br clear="none"><blockquote class="yiv1372323076gmail_quote" style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;"><div class="yiv1372323076yqt8485507573" id="yiv1372323076yqt62780"><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" rel="nofollow" shape="rect">CUBE Media Anti-Tromboning</a><div><br clear="none"></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 clear="none"></div><div>CUCM ---IP---> VGW ---T1/PRI---> PBX</div><div><br clear="none"></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 clear="none"></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" rel="nofollow" shape="rect">as described in the CUCM SRND</a>.</div><div><br clear="none"></div><div>Though, without real-world working experience, it's hard to know if I'm right or not.</div><div><br clear="none"></div><div>So, I know there's some good legacy telco knowledge out on this list. What do you know? Thanks!</div></div></div>
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