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New Member

FXO not disconnection

Dear All

I need an urgent help

I’m using CME Ver 8.6 and unity express running on sm-sre-710-k9   at Saudi Arabia

If someone call our land line, call redirect to auto attendant if only no one answer, EXT keep ringing and fxo port stay on

voice class custom-cptone 2

dualtone disconnect

  frequency 425

  cadence 500 500

voice-port 0/0/0

supervisory disconnect dualtone mid-call

supervisory custom-cptone 2

cptone BR

timeouts call-disconnect 0

connection plar opx xxx

caller-id enable


Re: FXO not disconnection


this is a well known issue in FXO setup. the disconnect signal it depends on the PBX you are connected from PSTN provider. the disconnect signals are different from one vendor to other, Ericson, Siemens, Alcatel,... etc.

You need to take the appropriate disconnect signal from your PSTN provider if it is possible.

you can use the following link to look for your current disconnect signal

if one of the above is not working you need to take pcm captures, find the below link

to take pcm capture use the following command

1. Enable the capture:

    Router(config t)#voice hpi capture buffer 5000000

    Router(config t)#voice hpi capture destination flash:FileName.pcm.dat

2. Start the capture:

    Router#test voice port x/y/z pcm-dump caplog 7

3. Place a call on that port, and disconnect from the far end.

4. After the call has been disconnected from the PSTN side, disable the capture with the command below.

   Be sure to do this, or otherwise the router flash will be full and the router will hang.

   Router#test voice port x/y/z pcm-dump disable

   Router(config t)#no voice hpi capture destination

5. Please send me this .dat file with the bad capture so I can extract it into PCM audio files.



please rate all helpful posts

FXO not disconnection

Hi Ismaeel,

also take a look for the following thread



please rate all the helpful posts

New Member

Did u get a solution? facing

Did u get a solution? facing same problem now. really appreciate your help. :)

New Member

voice class custom-cptone STC

voice class custom-cptone STC
 dualtone disconnect
  frequency 398
  cadence 502 497


sorry i was out