[Asterisk-Users] Missing 31 DTMF tones over ZAP

[C F]

what zap device are you using?
IIRC disalbing the vpmdtmf on a 406 or 411 might help you. I think
it's done in wctxx4p.c

On 2/24/06, Matt King <m at orderlysoftware.com> wrote:
> Hello,
>
>     I'm posting this to the list in case others run into the same issue.
>
>     I've recently been connecting * to a legacy Avaya InDEX switch over
> E1 ISDN PRI here in the UK.  Everything was working OK, except that DTMF
> digits were not being recognised by * when sent by the Avaya switch to
> the * system.  Instead, the background noise of the call centre would be
> silenced while users hit the keys on their phones - echo tests and
> RecordFile produced a flatline response.
>
>     I had at first thought that the Avaya switch may not be sending
> them, however this was working when * was not in the call path.
>
>     With further testing, I've found out that it is in fact only the
> first 31 DTMF tones that are missing - those following are picked up
> OK.  I've got no idea why this should happen, and have kludged a fix by
> having the Avaya switch send out 31 'fake' tones before the user starts
> entering data (using Translation inside Route List).   If anyone has
> come across this before and knows of a 'proper' fix, or even what might
> be causing the issue, I'd be very grateful for the information.
>
>     Hope this helps,
>
>        Matt King, M.A. Oxon.
>        Managing Director, Orderly Software Ltd.
>
>
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