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New Member

Voip Callback (CCBS) and DTMF problem

We have a branch office PBX over LL using Voip. Branch office subscribers connect to the PSTN through the central router then the central PBX.

Our problem is DTMF tones can not be used for outgoing calls to PSTN.

And also CCBS (completion of calls to busy subscribers) can not be made through our network.

Any help would be much appreciated.

2 REPLIES
Cisco Employee

Re: Voip Callback (CCBS) and DTMF problem

Need to know how PBX is sending DTMF, inband or an out of band method similar to RFC2833? Where is the cisco gear? ;-)

Chester

New Member

Re: Voip Callback (CCBS) and DTMF problem

Hi, did you solve this issue?

I got the same problem about CCBS.

The ISDN configuration we use is:

interface Serial0/1/1:15

no ip address

encapsulation hdlc

no logging event link-status

isdn switch-type primary-qsig

isdn overlap-receiving

isdn incoming-voice voice

isdn send-alerting

isdn sending-complete

no isdn gtd

no cdp enable

And also, CCBS can not be made through our network.

thanks for your help.

-Mario

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