[VoiceOps] Broadworks/Polycom/Webex Conferences and DTMF issues

Stephen Sprunk stephen at sprunk.org
Fri Mar 26 09:59:19 EDT 2010

On 16 Mar 2010 08:29, Dawson, Robert wrote:
> I’ve got a customer that is experiencing issues with DTMF recognition
> when utilizing Webex Conference services. I have adjusted DTMF length
> and level to the point that it is causing issues with some other
> services but they are still reporting failures. I can intermittently
> replicate the issue as well. Anyone experience anything similar? Thoughts?
> ...
> G.711/RFC2833/L3

I've found that increasing tone.dtmf.level on the Polycom phones from
the default of "-15" to "-12" or "-9" often helps with problems where
conference bridges, IVR systems, etc. aren't receiving some/all of the

If that doesn't help, you will need to work with L3 support.  They have
had numerous DTMF issues with their gateway vendor over the years, and
you may be running into the next in a long line of bugs from them.


Stephen Sprunk         "God does not play dice."  --Albert Einstein
CCIE #3723         "God is an inveterate gambler, and He throws the
K5SSS        dice at every possible opportunity." --Stephen Hawking

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