[Asterisk-Users] Ignoring Incoming RFC2833 DTMF?

[Rusty Dekema]

Does anyone know if it is possible to configure Asterisk in such a way that
it will ignore RFC2833 DTMF signals received from a SIP peer?

I am using Broadvoice for some DIDs at the moment and their system has a
tendency to mis-interpret DTMF digits, especially ones dialed from mobile or
office (digital) phones. Basically, it will catch every digit dialed and
send it to my Asterisk system, but unfortunately it frequently seems to
repeat digits. That is, if I call into my system and want to enter a
password of "123456789", Broadvoice will send something to my Asterisk
machine such as "11234556789" or "12345567889".

I have set dtmfmode=inband in both [general] and
[sip.broadvoice.com<http://sip.broadvoice.com>]
in sip.conf, but from viewing the results of 'rtp debug', it appears that
Broadvoice is still sending me the digits via RFC2833. I was thinking that
if I could get Asterisk to ignore this and just detect the DTMF tones
inband, that it might do a better job than Broadvoice's system.

If anyone knows how to do this, or has any other suggestions, I will be very
glad to hear them. This problem has been driving me nuts. I am very
satisfied with Broadvoice's voice quality, and I have a good network
connection between my location and their SIP gateway, but more-or-less
correct DTMF detection is fairly important for me and it basically does not
work; but I really don't want to have to switch to using POTS lines for all
inbound calls.

Thanks,
Rusty
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