UC520 CME DTMF Too short/fast

Unanswered Question
Mar 9th, 2009

Does it possible to configure a longer DTMF tone generated by UC520 CME when key press on the IP handset ? Currently it is too short/fast for some of the IVR to recognize it.


I have this problem too.
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Nicholas Matthews Tue, 03/10/2009 - 14:40

Hi Gerald,

If you have a FXO port, you can use this command:

voice-port 0/0/0

timing digit

The default is 100 ms. By ITU standards, anything over 40ms should be detected.



Gerald Chong Wed, 03/11/2009 - 12:57

Thanks Nick.

Unfortunately I'm using the SIP trunk and the dial peer is setup as "dtmf-relay rtp-nte"

Any possibilities to change DTMF timing sent through the RTP ?

Nicholas Matthews Wed, 03/11/2009 - 19:28

This is actually good news.

You can try this:

On 12.4(20)T and later:

voice service voip




Gerald Chong Thu, 03/12/2009 - 01:10

The UC520 is on 12.4(24)T.

Just test out, it doesn't give any different. And still not able to access some of the IVR.


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