FXO port get busy tone

[Gidonitzhak]

Hii,

I have an issue in my lab, i have this scenario:

I'm using a router with fxo ports and E1 port configuring as PRI, the router connecting to a call manager through a sip trunk.  

I'm starting a call between a phone inside the network and a cellular phone outside the network, The issue happens when the phone from outside hangs out the call, The phone inside getting busy tone instead of hanging out the call

If the the phone from inside hangs out the call, everything is OK. 

Thanks.

[saif musa]

Hi,

This issue is wildly known, chick below link. It will guide you to the solution.

http://www.cisco.com/c/en/us/support/docs/voice/analog-signaling-e-m-did-fxs-fxo/8120-fxo-disconnect.html

Regards

[Gidonitzhak]

Hi,

Thank you for answering, I will check that solution.

[Gidonitzhak]

I tried to change the "Supervisory disconnect signal"

And "timeout disconnect timer" and it didn't help.

The fxo still didn't disconnect and the phone have a busy tone.

[saif musa]

Hi,

Refer to below link, it may help

http://www.ipbalance.com/IT/voip/cucme/how-to-fix-cisco-fxo-voice-card-disconnect-issue/

Regards

[Gidonitzhak]

Hi,

Thanks for helping,

I did as same as the link and still the phone gets busy tone.

[Mauro Barbosa]

Hi.

(Sorry I'm not good writting in English)

I think your problem is your disconnect frequency and cadence.

Try to record the busy tone (I use Whireshark), and open it with some audio program with FFT analyser (WavePad, for example). The FFT analyser give you the tone frecuency, and you can see de cadence to config in the router.

Then you can config something like this:

voice class custom-cptone newfreq
dualtone out-of-service
frequency 1200 1290
cadence 248 248
dualtone disconnect
frequency 425     <- the one you get from FFT
cadence 500 500    <-- you need to set just one cicle (this example is 500 sound, 500 silence...)

Then, in your voice-port:

supervisory disconnect dualtone mid-call
supervisory custom-cptone newfreq
supervisory dualtone-detect-params 1

Good luck!