[cisco-voip] SCCP ip phones and in-band DTMF problem

[Nick Matthews]

>From memory it would detect the dtmf mismatch and do it more or less
automagically.

If you do a 'show sccp' it should show the dtmf options.  I believe it
was inserted into the code around 12.4(11)T.  It should show a in-band
dtmf to out of band dtmf transcoding option.  This may be the problem
if it will only do it on a SIP-SIP leg rather than SCCP-SIP.

I don't think there's a way to force CME phones to use RFC 2833.  You
could loop it back through the CME via SIP and then you would have
SIP-SIP, just need some translation patterns.

-nick

On Mon, Oct 17, 2011 at 6:23 PM, Robert Hass <robhass at gmail.com> wrote:
> On Mon, Oct 17, 2011 at 11:12 PM, Nick Matthews <matthnick at gmail.com> wrote:
>> You can create a transcoder on CME, and it will convert the SCCP out
>> of band DTMF to in-band DTMF.
>
> Nick, I configured transcoder on CME (below I attached added
> configuration). But how I can associate transcoder to dial-peer ? When
> I'm making call the DTMF still not works and it's look transcoder is
> not used.
>
> voice-card 0
>  dspfarm
>  dsp services dspfarm
> sccp local GigabitEthernet0/0.11
> sccp ccm 10.0.0.1 identifier 1 version 7.0
> sccp
> !
> sccp ccm group 1
>  associate ccm 1 priority 1
>  associate profile 1 register mydsps
> !
> dspfarm profile 1 transcode
>  codec g711ulaw
>  codec g711alaw
>  codec g729ar8
>  codec g729abr8
>  maximum sessions 4
>  associate application SCCP
> !
> telephony-service
>  sdspfarm units 1
>  sdspfarm transcode sessions 4
>  sdspfarm tag 1 mydsps
>
> BR,
> Robert
>