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Supervision Loss on Transfer

I have a Cisco site that is connected into a networked PBX system. I have loop start CO lines coming into the site with dual tone mid-call supervision. Supervision works properly and I get timely FXO release on call to a phone at the site. If CallManager forwards the call into the PBX's voice mail, the voice mail system doesn't see the far-end hang-up. It seems like supervision is not being forwarded. Currently I'm using MGCP, and will be going to H.323. The CallManager definition for the ports is loop start. Is there anything that I need to do for MGCP to solve this, and will switching to H.323 help? The system lloks like this:

PSTN --- FXO 2620 (MGCP) --- CallManager (3.2.1) --- VG200 (H.323) --- PBX




Re: Supervision Loss on Transfer

Often times complex troubleshooting issues are best addressed in an interactive session with one of our trained technical assistance engineers. While other forum users may be able to help, it’s often difficult to do so for this type of issue.

To utilize the resources at our Technical Assistance Center, please visit and to open a case with one of our TAC engineers, visit

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.