asterisk users - Jun 2004 - Outgoing DTMF when using BRI & i4l (Eicon Diva) - problems

Hello all,

This afternoon I had a BRI line installed by Telstra (our telco in
Australia). I'm using an Eicon Diva 2.02 PCI ISDN card with the isdn4linux
driver.

Incoming and outgoing calls with Asterisk work fine (and with no echo - my
main reason for getting ISDN). However, I can't seem to get outgoing DTMF
working (incoming works fine).

I made a call from my desk phone (Cisco 7940G) to a POTS(PSTN) phone to test
and pressed a few buttons - nothing came through.

I know it's not a configuration issue between the phones (confirmed with
Cisco 7940, Grandstream Budgetone 101 and X-Lite softphone) and Asterisk as
outbound dtmf works with iax providers and my X100P card.

I came across a similar issue in the archives using the same ISDN card, but
there was no resolution.

If anybody has any insight it would be greatly appreciated. My modem.conf
file is at the end of this email if it helps.

Thanks,

Shaun

Begin modem.conf

[interfaces]

context=incoming-isdn
driver=i4l
language=en
type=autodetect
;This I'm doing directly in the extension.conf
;stripmsd=1

dialtype=tone
;dialtype=pulse

;mode=answer
;mode=ring
mode=immediate

; ISDN example

group=1
;registered one number.
msn=4625xxxx
;accepting several more. Could have used * as well
;incomingmsn=57966,57881,57882,57883,57884,57885,57886,57887
incomingmsn=4625xxxx
device => /dev/ttyI0
device => /dev/ttyI1

Further to my previous post;

It seems that if Asterisk recognises the DTMF digits, it will intercept them
and not send them to the ISDN card (either that, or the ISDN card isn't
regenerating them).

If I change the dtmf mode that the phone is using to something different to
what Asterisk is expecting, the dtmf through ISDN works but not with
anything else (IAX, Voicemail, etc).

Does anybody know if there is a way to get Asterisk to ignore digits dialed
when bridged with an ISDN channel - or does anybody have any ideas?

Thanks,

Shaun

This is an issues with DTMF clamping, you need to use chan_capi to get DTMF 
working correctly.


Jason
At 18:30 15/06/2004 +1000, you wrote:
>Hello all,
>
>This afternoon I had a BRI line installed by Telstra (our telco in
>Australia). I'm using an Eicon Diva 2.02 PCI ISDN card with the
isdn4linux
>driver.
>
>Incoming and outgoing calls with Asterisk work fine (and with no echo - my
>main reason for getting ISDN). However, I can't seem to get outgoing
DTMF
>working (incoming works fine).
>
>I made a call from my desk phone (Cisco 7940G) to a POTS(PSTN) phone to test
>and pressed a few buttons - nothing came through.
>
>I know it's not a configuration issue between the phones (confirmed with
>Cisco 7940, Grandstream Budgetone 101 and X-Lite softphone) and Asterisk as
>outbound dtmf works with iax providers and my X100P card.
>
>I came across a similar issue in the archives using the same ISDN card, but
>there was no resolution.
>
>If anybody has any insight it would be greatly appreciated. My modem.conf
>file is at the end of this email if it helps.
>
>Thanks,
>
>Shaun
>
>Begin modem.conf
>
>[interfaces]
>
>context=incoming-isdn
>driver=i4l
>language=en
>type=autodetect
>;This I'm doing directly in the extension.conf
>;stripmsd=1
>
>dialtype=tone
>;dialtype=pulse
>
>;mode=answer
>;mode=ring
>mode=immediate
>
>; ISDN example
>
>group=1
>;registered one number.
>msn=4625xxxx
>;accepting several more. Could have used * as well
>;incomingmsn=57966,57881,57882,57883,57884,57885,57886,57887
>incomingmsn=4625xxxx
>device => /dev/ttyI0
>device => /dev/ttyI1
>
>_______________________________________________
>Asterisk-Users mailing list
>Asterisk-Users@lists.digium.com
>http://lists.digium.com/mailman/listinfo/asterisk-users
>To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users

Hi!
> It seems that if Asterisk recognises the DTMF digits, it will intercept
them
> and not send them to the ISDN card (either that, or the ISDN card isn't
> regenerating them).
My guess: isdn4linux is the culprit.

Cheers, Philipp