Anti-Tromboning on an S8800

[zmather]

I'm in the process of connecting a ShoreTel system to an existing Avaya S8800 system over a T1 line via QSIG. We keep experiencing disconnects between the two systems and in troubleshooting, the ShoreTel tech has advised that the "Trombone/2 B channel" is disabled.

Problem is I have no idea where that would be and haven't yet seen that configuration in any of the trunk, signaling group, etc. places. Can somebody point in the right direction please?

 

[bleebrant]

On your trunk group form, under the QSIG parameters I believe you need to have Path Replacement with Retention set to yes.