Thanks for all the advice. An update on this issue:

We have been in contact with the carrier. They have indicated that others have 
had similar issues, all since moving to a “new” softswitch at the CO. The CO 
tech has apparently verified that the signalling is going out, but doesn’t get 
passed through the DSLAM that is somewhere in between the CO and our premise.

Is there anyone who is knowledgeable about telephone standards & regulations? 
Is the carrier REQUIRED to do disconnect supervision, or is it merely a 
courtesy?

On Sep 12, 2016, at 1:11 AM, Esmaeel Saberi 
<esmae...@gmail.com<mailto:esmae...@gmail.com>> wrote:

EXTERNAL

This link is usefull 😉
https://supportforums.cisco.com/discussion/11127921/fxo-4-voice-ports-always-busy
On Mon, Sep 12, 2016 at 10:34 AM Esmaeel Saberi 
<esmae...@gmail.com<mailto:esmae...@gmail.com>> wrote:
Hello
You must record the sound of busy or congestion tone and define the frequency in
router

On Mon, Sep 12, 2016 at 5:21 AM Sreekanth 
<sknt...@gmail.com<mailto:sknt...@gmail.com>> wrote:
Hi Scott,

When reaching out to the telco, ask them what kind of disconnect they're doing. 
Is it:
1. Battery reversal
2. Power denial
3. Supervisory disconnect - tone played by the telco to indicate a disconnect

You've mentioned that when the remote party disconnects, the VoIP phone stays 
off hook. Do you hear a disconnect tone during this period? If so, the telco is 
using supervisory disconnect.
In that case, your DSPs on the router may need a tweak. You can do 2 things:

1. Take pcm captures on the router to capture the disconnect tone. Then open a 
case with TAC who can decode this and give you the settings for the supervisory 
disconnect.
2. Do the ds0-dump on the router and capture the tones, decode them yourself 
using Audacity and put in the settings.

DS0-dump: 
http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-system/115749-analyze-pcm-data.html

Video for setting up pcm captures and Ds0-dump.
https://www.youtube.com/watch?v=HkPjTBvx_YA

Cheers!

On 12 September 2016 at 05:30, Ryan Huff 
<ryanh...@outlook.com<mailto:ryanh...@outlook.com>> wrote:

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 <shug...@grenergy.com<mailto:shug...@grenergy.com>>
Sent: Sunday, September 11, 2016 7:13 PM
To: Ryan Huff
Cc: cisco-voip@puck.nether.net<mailto:cisco-voip@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 
<ryanh...@outlook.com<mailto:ryanh...@outlook.com><mailto:ryanh...@outlook.com<mailto:ryanh...@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 
<shug...@grenergy.com<mailto:shug...@grenergy.com><mailto:shug...@grenergy.com<mailto:shug...@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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