[Asterisk-Users] DTMF inband detection improvement

[Steve Underwood]

Hi Florian,

If you really are using ulaw, and you do not have extreme packet loss or 
jitter, DTMF detection should be very reliable. It is no better in CVS 
HEAD because it wasn't broken in the first place.

What does wrong with DTMF detection? Do you realise how DTMF from a GSM 
phone works? If you get digits when you press them really slowly on the 
phone, but miss some when you press them fast, then welcome to the land 
of GSM :-) The DTMF tones don't come from phone. The come from the 
basestation. Most basestations stretch each digit to well over a second. 
It really screws up any attempt at timing based entry methods. :-(

Regards,
Steve

Florian Lefeuvre wrote:

> Hi all,
>
> I have some probleem detecting DTMF send by a GSM phone,
> I'm using SIP with ulaw.
> do you know what are the options to improve the detection ?
> I'm using asterisk 1.05,
> is the CVS HEAD version had some improvement about DTMF detection?
>
> Florian.