[Asterisk-Users] isdn dtmf mis-detection

[Chrétien Wetemas]

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 at websitemanagers.com.au>
To: <asterisk-users at 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
>
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