[cisco-voip] Anti-Tromboning Tie Lines to PBX

[Brian Meade]

Also known as 2 B-channel Transfer or TBCT (should help your searching).

On Tue, Mar 7, 2017 at 5:54 PM, Anthony Holloway <
avholloway+cisco-voip at gmail.com> wrote:

> 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., CUBE Media Anti-Tromboning
> <http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/media-path.html#concept_674530029296875008039300537109374>
>
> 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.
>
> CUCM ---IP---> VGW ---T1/PRI---> PBX
>
> 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.
>
> 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, as described in the CUCM SRND
> <http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_5_1/ccmsys/accm-851-cm/a08procl.html#wp1156114>
> .
>
> Though, without real-world working experience, it's hard to know if I'm
> right or not.
>
> So, I know there's some good legacy telco knowledge out on this list.
> What do you know?  Thanks!
>
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