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Community Member

Problem : the Fxo is busy when we have incoming call

Hello,

i have IPCC that is co-resident with CCM 4.3, the problem is when i receive one call from outside and i want terminate without speaking with agent, the FXO port remains busy and i must configure shut and no shut do activate it.

Please help me.

6 REPLIES
Hall of Fame Super Gold

Re: Problem : the Fxo is busy when we have incoming call

Please see:

http://cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800ae2d1.shtml

Note, unless you are in N.A, you can only use the tone detection technique, with the exact tones for your contry. Nothing else will work.

Hope this helps, please rate post if it does!

Cisco Employee

Re: Problem : the Fxo is busy when we have incoming call

This is likely due to Supervisory Disconnect ... the phone company expects the users on either side of the network to drop calls on loop start trunks.

When the PSTN caller hangs up after the IPCC has answered the call, as far as the phone company is concerned, the call was answered and they are waiting for the called party to clear the call down. Since the IPCC is playing a message (your call is important,please wait/the queue is only nine hours long/relax and listen to some easy listening hits ...) , the FXO port is off hook and it will stay off hook until the destination party on the IPCC terminates the call, or someone pulls out the cable and drops the connection.

This is not a router/voice card problem - everything is working as designed !!! The telephone network expects calls to be hung up by the users on both sides - the telephone network does not hang up loop start trunks towards subscribers.

Here is a note on CCO that gives some more background -

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800ae2d1.shtml

So the best way to fix it ?

From the IP phone on you network, ring someone on the PSTN, then have them hang up on you. Do not hang up your phone. After a short time, you <> hear some kind of repeating tone pattern indicating the far end has disconnected. This is called a disconnect tone and the voice port DSP's can listen for this and automatically drop the call after a short timeout.

These disconnect tones vary from country to country. We need to know where you are , so we can make a suggestion about the best way to configure the voice port to detect the tone and drop the call.

Can you tell us where the router is located, and also post the SH RUN.

If you do a search on netpro for 'disconnect supervision' or 'disconnect tone' you will get quite a bit more background on this issue - it happens all the time ...

Community Member

Re: Problem : the Fxo is busy when we have incoming call

hello,

thank you for reply. I'm in Morroco (North Africa), now i cannot post the sh run because i'm out of the office, but if it's possible you can post me the config of disconnect tones that i can apply to my 2811 Router.

Thanks at advance.

Hall of Fame Super Gold

Re: Problem : the Fxo is busy when we have incoming call

Check the tones for your contry at:

http://www.3amsystems.com/wireline/tone-search.htm

Community Member

Re: Problem : the Fxo is busy when we have incoming call

hello,

thanks for reply, i have founded some tones that matches to my country, but i have not found the disconnect tones.

i don't know if what i found is intersting or not.

see below :

http://www.3amsystems.com/wireline/tone-search.htm?start=0&kCountry=120&kTone=&frequency=&cadence=

Hall of Fame Super Gold

Re: Problem : the Fxo is busy when we have incoming call

Usually it will be a busy tone. Have the caller hang-up and listen, if you cannot recognize the tone, you can either record from a PC with microphone, or do a wireshark capture, reassemle the audio file and post it here.

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