asterisk users - Apr 2004 - dtmf tone clamping in calls to external ivr

Hello,

I'm having trouble working out how to send DTMF tones to an external
IVR.  My system has an analog phone connected to a TDM400P card, a SIP
software phone (Zultys LIPZ4) and is connected to a BRI in Australia
with a NETjet-S card.  I'm using ISDN4Linux and a 2.4.25 kernel patched
with the ISDN audio patch from Traverse (which allows the card to do
voice).

DTMF works fine between the analog phone and the SIP phone - I can hear
the tones on the SIP phone when I use dtmfmode=inband and I can see them
with dtmfmode=info, and I hear them on the analog phone.

When I bring the ISDN link into the picture, such as to call to my phone
banking, it doesn't recognise any tones.  I have also tested this by
dialling my mobile (via the ISDN link) and it sounds like Asterisk is
clamping the tones - I hear the very first part of the tone then the
call is muted for the remaining duration of the tone.  I _can_ hear the
tones on my analog phone when I press them on the mobile, however, so it
seems the problem is only in the one direction.

I've been grepping the mailing list archives and found Pauline
Middelink's isdn-dsp patch (which I've applied in an attempt to solve
this problem - I've now got "features=dtmf,noquelch" in my
modem.conf),
but that seems to relate to digits coming _from_ the ISDN _to_ Asterisk,
not the other way around.  Looks like some people have run into my
problem before, but I cannot find any conclusions in the list archives.

Can anyone help?

Thanks in advance,
Mark

-- 
Mark Mickan <mark.mickan@articul-8.com>

Hi Mark,

sorry to say this, but you wont be able to forward dtmf with isdn4linux.
Try to get your hands on an AVM Fritz card (or any other isdn card with
capi drivers) and use chan_capi.

best regards

Klaus
-- 
Klaus-Peter Junghanns

CEO, CTO
Junghanns.NET GmbH
Breite Strasse 13a - 12167 Berlin - Germany
fon: (de) +49 30 79705390
fon: (uk) +44 870 1244692
fax: (de) +49 30 79705391
iaxtel: 1-700-157-8753
http://www.Junghanns.NET/asterisk/


Am Mo, 2004-04-26 um 17.43 schrieb Mark Mickan:
> Hello,
> 
> I'm having trouble working out how to send DTMF tones to an external
> IVR.  My system has an analog phone connected to a TDM400P card, a SIP
> software phone (Zultys LIPZ4) and is connected to a BRI in Australia
> with a NETjet-S card.  I'm using ISDN4Linux and a 2.4.25 kernel patched
> with the ISDN audio patch from Traverse (which allows the card to do
> voice).
> 
> DTMF works fine between the analog phone and the SIP phone - I can hear
> the tones on the SIP phone when I use dtmfmode=inband and I can see them
> with dtmfmode=info, and I hear them on the analog phone.
> 
> When I bring the ISDN link into the picture, such as to call to my phone
> banking, it doesn't recognise any tones.  I have also tested this by
> dialling my mobile (via the ISDN link) and it sounds like Asterisk is
> clamping the tones - I hear the very first part of the tone then the
> call is muted for the remaining duration of the tone.  I _can_ hear the
> tones on my analog phone when I press them on the mobile, however, so it
> seems the problem is only in the one direction.
> 
> I've been grepping the mailing list archives and found Pauline
> Middelink's isdn-dsp patch (which I've applied in an attempt to
solve
> this problem - I've now got "features=dtmf,noquelch" in my
modem.conf),
> but that seems to relate to digits coming _from_ the ISDN _to_ Asterisk,
> not the other way around.  Looks like some people have run into my
> problem before, but I cannot find any conclusions in the list archives.
> 
> Can anyone help?
> 
> Thanks in advance,
> Mark

On Mon, 26 Apr 2004, Klaus-Peter Junghanns wrote:
> sorry to say this, but you wont be able to forward dtmf with isdn4linux.
> Try to get your hands on an AVM Fritz card (or any other isdn card with
> capi drivers) and use chan_capi.
Could I use a pair (NT+TE) of HFC-S cards (for exampel the Acer ISDN 128
Surf PCI) together with your zaphfc and chan_capi to make this work?

Or would it be better to have one AVM Fritzcard for the communcation to
the PSTN and a HFC card for being able to use the NT mode?

Regards,
Tobias
(with the same problem as Mark)

Tobias,

yes you can use 2 hfc-pci cards to do this (and also enjoy the benefit
of echo cancelation), but the zaphfc driver is still a bit experimental.
(however it drives my phone at home without problems...)
Just grab some cheap hfc-pci cards and see for yourself.

best regards

Klaus
-- 
Klaus-Peter Junghanns

CEO, CTO
Junghanns.NET GmbH
Breite Strasse 13a - 12167 Berlin - Germany
fon: (de) +49 30 79705390
fon: (uk) +44 870 1244692
fax: (de) +49 30 79705391
iaxtel: 1-700-157-8753
http://www.Junghanns.NET/asterisk/


Am Mo, 2004-04-26 um 19.20 schrieb Tobias Jönsson:
> On Mon, 26 Apr 2004, Klaus-Peter Junghanns wrote:
> 
> > sorry to say this, but you wont be able to forward dtmf with
isdn4linux.
> > Try to get your hands on an AVM Fritz card (or any other isdn card
with
> > capi drivers) and use chan_capi.
> 
> Could I use a pair (NT+TE) of HFC-S cards (for exampel the Acer ISDN 128
> Surf PCI) together with your zaphfc and chan_capi to make this work?
> 
> Or would it be better to have one AVM Fritzcard for the communcation to
> the PSTN and a HFC card for being able to use the NT mode?
> 
> Regards,
> Tobias
> (with the same problem as Mark)
> 
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