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New Member

Call disconnect problem with FXO VIC's in 3640 router

When I place a call from my pbx (using fxo modules in a 3640 router) to my IP phone and the IP Phone does not answer, the fxo does not disconnect the call when I go on-hook. I have tried 2 IOS versions. Is there a known bug, work around or timeout that I can place on the voice port or dial-peer to tear the call down. This is a lab environment, but I have a customer network that I duplicated this scenario in. We cannot do supervisory disconnect due to PBX interoperability issue on the customer side.

Cisco Employee

Re: Call disconnect problem with FXO VIC's in 3640 router

You need to find out what type of disconnect supervision your pbx supports. There are 3 main ones that come to my mind. Power denial (usually from telco), battery reversal (usually on pbx, but need fxo-m1), and supervisory disconnect tone (you have to put in the tone range the telco or pbx will play when disconnecting the call).

You can search for each of the on

Thank you,


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