Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

loopstart FXO port ringing problem

I have a problem in a FXO to FXO connections.

I am using Cisco routers with VIC-4FXO and CUCM 6 with MGCP protocol.

This is a schematic view of my scenario:

[telephone A]________[PBX A]________[router A]________[router B]________[PBX B]________[telephone B]

All functions like disconnect supervision work fine except in case below:

When  station A calls station B, telephone B starts ringing. Before B answer  the call, station A disconnect the call BUT telephone B remains RINGING  continuously forever.

I also tried "timeouts wait-release" command, but it doesn't helped.

Any ideas???

Beside the main problem I tried to limit the maximum number of rings by "timeouts ringing" command, but doesn't worked. How can I limit it in router or CUCM?

New Member

Re: loopstart FXO port ringing problem

Cisco Employee

Re: loopstart FXO port ringing problem

Are you running a back to back FXO connection?  For example:


If so, this is your problem.  If you are running a back to back analog line, one end must be FXO, and the other must be FXS.

CreatePlease login to create content