asterisk users - Mar 2003 - isdn dtmf mis-detection

Well, since the overwhelming silence as to the location of the oft mentioned
patches to the Linux kernel and asterisk to move the isdn dtmf detection
from the kernel to asterisk itself I had yet another search using google for
these items. I still haven't found them, but I think I have managed to
create my own patch to disable the linux kernel side of the dtmf detection.
Don't ask me if I have broken anything else etc, but it looks right to me,
and I have been able to make an outbound call through the isdn card with my
patched kernel. (of course, anyone who dials into the * box won't be able to
have dtmf recognised as there is *NO* dtmf detection anywhere at the
moment).

Basically all I did is comment out a few lines as can be seen from this
snippet of drivers/isdn/isdn_audio.c
                        else
                                s->buf[s->idx++]                          
isdn_audio_ulaw_to_s16[*buf++] >> (15 -
AMP_BITS);
                }
/*              if (s->idx == DTMF_NPOINTS) {
                        isdn_audio_goertzel(s->buf, info);
                        s->idx = 0;
                }
*/              len -= c;
        }
}

silence_state *
isdn_audio_silence_init(silence_state * s)
{
        if (!s)

This is a small section from kernel version 2.4.21-pre5 (pre4 apparently had
some improvements, but they didn't seem to help for me, well, they seem to
be improved but still too problematic (too many complaints) to be usable.

If anyone who knows more than me thinks I've done something stupidly wrong,
please let me know, otherwise, I'll try this for a few days and see what
happens. (I only use the ISDN lines for outbound calls at the moment).

Regards,
Adam

Here's a patch against the 2.4.20 kernel isdn_audio.c I've found on the
web.
Haven't tried it myself.

http://www.cs.helsinki.fi/linux/linux-kernel/2002-50/0301.html

Cris


----- Original Message -----
From: "Adam Goryachev" <mailinglists@websitemanagers.com.au>
To: <asterisk-users@lists.digium.com>
Sent: Monday, March 24, 2003 11:09 AM
Subject: [Asterisk-Users] isdn dtmf mis-detection

> Well, since the overwhelming silence as to the location of the oft
mentioned
> patches to the Linux kernel and asterisk to move the isdn dtmf detection
> from the kernel to asterisk itself I had yet another search using google
for
> these items. I still haven't found them, but I think I have managed to
> create my own patch to disable the linux kernel side of the dtmf
detection.
> Don't ask me if I have broken anything else etc, but it looks right to
me,
> and I have been able to make an outbound call through the isdn card with
my
> patched kernel. (of course, anyone who dials into the * box won't be
able
to
> have dtmf recognised as there is *NO* dtmf detection anywhere at the
> moment).
>
> Basically all I did is comment out a few lines as can be seen from this
> snippet of drivers/isdn/isdn_audio.c
>                         else
>                                 s->buf[s->idx++] >                
isdn_audio_ulaw_to_s16[*buf++] >>
(15 -
> AMP_BITS);
>                 }
> /*              if (s->idx == DTMF_NPOINTS) {
>                         isdn_audio_goertzel(s->buf, info);
>                         s->idx = 0;
>                 }
> */              len -= c;
>         }
> }
>
> silence_state *
> isdn_audio_silence_init(silence_state * s)
> {
>         if (!s)
>
> This is a small section from kernel version 2.4.21-pre5 (pre4 apparently
had
> some improvements, but they didn't seem to help for me, well, they seem
to
> be improved but still too problematic (too many complaints) to be usable.
>
> If anyone who knows more than me thinks I've done something stupidly
wrong,
> please let me know, otherwise, I'll try this for a few days and see
what
> happens. (I only use the ISDN lines for outbound calls at the moment).
>
> Regards,
> Adam
>
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users