[cisco-voip] FXO Disconnect Detection

[Esmaeel Saberi]

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 <sknth.n at 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 <ryanhuff at 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 <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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