[Asterisk-Users] Asterisk, inband DTMF send by a GSM mobile

[Florian Lefeuvre]

Hi all,

I use a GSM device to send dtmf on my asterisk system (via SIP).
the codec I use is ulaw (or a-law).
dtmf mode is INBAND.
relaxmode is on.
but most of the case,  I 'missed' some DTMF or
I 'double' one.
as anybody as seen this before?
is there any way to prevent this


thanks