[cisco-voip] FXO Disconnect Detection

[Ryan Huff]

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> 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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