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New Member

When FXO port is called from PSTN, Cisco phone continues to ring

I have a 2 - 2 port FXO modules.  On one of these I have two lines from PSTN.  Both ports are configured the same (as far as I can tell), port 1/0/1 works fine, but port 1/0/0, when a call is received continues to ring even though the user (Cisco phone) has answered.  The caller continues to hear ringback, but the user can faintly hear the caller talk.  I have switched the connection from the PSTN and the problem stays on that port.  So I know it is not the line cord, jack, or problem with the business line from the PSTN.

Any idea?  Please let me know.

Thank You,

Melinda

3 REPLIES
Hall of Fame Super Red

Re: When FXO port is called from PSTN, Cisco phone continues to

Hi Melinda,

This is refered to as "Answer Supervision" here is a doc that details this feature

FXO Answer and Disconnect Supervision

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ft_ansds.html

Sometimes is simple shut/no shut on the port can alleviate this problem.

Hope this helps!
Rob

New Member

Re: When FXO port is called from PSTN, Cisco phone continues to

Rob,

Thanks for the reply!

I did read up on this before posting the question and thought I understood that it was either Battery Reversal or Answer/Disconnect Supervison needed to be set.  Both ports (working and not working) are set to Battery Reversal.  Since the port that is working is set to Battery Reversal, I didn't think that was the problem.  Do you think I should change the port that is not working to Answer Supervision and if it works, I will be confused?

Also, I have done the shut/no shut on the port.

Please let me know your thoughts.

Thanks,

Melinda

New Member

Re: When FXO port is called from PSTN, Cisco phone continues to

Rob,

I just changed the port from Battery to Answer Supervision and had the same result.

I thought about reseeding the FXO module?

Please let me know.

Thanks,

Melinda

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