[cisco-voip] FXO Disconnect Detection

[Ryan Huff]

Scott,


You are correct, it is the default. Oddly, what I meant to suggest is that you try disabling (no battery-reversal) but it seems that I suggested you to enable it (in which it has always been enabled). Try disabling the support and see what happens.


Apologies!


Thanks,


Ryan

________________________________
From: Hughes, Scott GRE-MG <SHughes at GREnergy.com>
Sent: Sunday, September 11, 2016 7:13 PM
To: Ryan Huff
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] FXO Disconnect Detection


:-/ unfortunately, that command must already be a default is IOS 15.5M because it doesn't show up in the running config after I put it in.

Thanks for the suggestion though!


On Sep 9, 2016, at 6:21 PM, Ryan Huff <ryanhuff at outlook.com<mailto:ryanhuff at outlook.com>> wrote:

EXTERNAL

You may try enabling support for battery reversal detection on the voice port;

voice-port x/x/x
battery-reversal
!

-Ryan

On Sep 9, 2016, at 6:57 PM, Hughes, Scott GRE-MG <SHughes at GREnergy.com<mailto:SHughes at GREnergy.com>> wrote:

Hi,

I have a Cisco 2921 H.323 gateway tied to CUCM 11 with 4 FXO (loop start) ports in a trunk group. Unanswered calls get forwarded to an offsite answering service (hairpinning out of the same set of FXO ports). Ports are setup with "connection plar opx 1000"

My issue is that ports don't detect when the other end hangs up. When a remote party hangs up, the VoIP phone stays off hook and eventually plays a dial tone, followed by an operator message.

I suspect that the forwarded calls terminate but both FXO ports in the hairpin stay off hook indefinitely.

How can I combat this problem? I can reach out to the telco but need to know what to ask for.

I am located in the US, if that makes a difference. I've read many articles about supervisory disconnection but none really help with troubleshooting steps or timers to tweak.

-Scott


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