[asterisk-users] Double DTMF digits

[Greg Oliver]

On Sun, 2007-05-13 at 20:54 +0300, Dovid B wrote:
> I am actually getting DTMF over SIP when people call in to a clients system 
> that is running a2billing. They are using RFC2833.
> 

If you are using a Cisco router anywhere in the loop, there is a known
bug that causes rfc2833 and inband signalling to cause double DTMF.  It
is fixed in IOS > 12.4.11T