[cisco-voip] DTMF settings in CUCM

[Joe Loiacono]

It's 10.0.1

The phone is a Valley Communications SVC-2 with the following settings:
In band or Out of band DTMF tones:  Out of band
Length of tone on and off time:  100
Out of band DTMF payload type:  102
 
Under Clusterwide parameters (H.323) we found and set:

H225 DTMF Duration: 100
Audio Bandwidth for Call Counting CAC: 102

... might be coincidence, and it seems to work. 

Thanks,

Joe



From:   Nick Britt <nickolasjbritt at gmail.com>
To:     Brian Meade <bmeade90 at vt.edu>
Cc:     Joe Loiacono/USA/CSC at CSC, cisco-voip 
<cisco-voip-bounces at puck.nether.net>, "cisco-voip at puck.nether.net" 
<cisco-voip at puck.nether.net>
Date:   08/28/2017 02:09 PM
Subject:        Re: [cisco-voip] DTMF settings in CUCM



Hi Joe,

Can I ask which version of CUCM you are using? there are some known issues 
with DTMF in 10.5.2

On Mon, Aug 28, 2017 at 10:40 AM, Brian Meade <bmeade90 at vt.edu> wrote:
CUCM will try to negotiate inband (RFC2833) and out of band.

I don't believe you can edit length of tone or on/off times for RFC2833.

To use true inband, you need a universal transcoder.

It tries to negotiate a few different methods such as Unsolicited Notify, 
KPML, and SIP Info (I believe receive but not send on this one).  You 
can't hard set to use a certain out of band DTMF method.  It should 
automatically negotiate.  You'll have to check the SIP signaling.

On Mon, Aug 28, 2017 at 1:28 PM, Joe Loiacono <jloiacon at csc.com> wrote:
Having difficulties with a third-party conference phone losing DTMF 
capability. 

Does anyone know where to find these settings in CUCM? 
  
In band or Out of band DTMF tones 
Length of tone on and off time 
Out of band DTMF payload type 

Thanks, 

Joe
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-- 
- Nick
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