[Asterisk-Users] Problems w. chan_capi + ztdummy - SNOM Problem?

[Lars Boegild Thomsen]

A bit more clarification.  If I disable alaw in asterisk but everything else
as described, gsm codec is being used again.  So seems like the Snom 200 got
a preference for alaw even if gsm is the default and has highest priority in
sip.conf.

Next question is why it sounded so awfull with incoming Capi -> SIP with
alaw codec to the Snom.  But I can live with alaw being disabled so :)

> -----Original Message-----
> From: asterisk-users-admin at lists.digium.com
> [mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Lars Boegild
> Thomsen
> Sent: 18 May 2004 13:12
> To: asterisk-users at lists.digium.com
> Subject: RE: [Asterisk-Users] Problems w. chan_capi + ztdummy - SNOM
> Problem?
>
>
> Actually I've played around with the last issue quite a lot and this is
> indeed getting weirder.
>
> Let me try to describe the problem.
>
> sip.conf is configured with:
>
> disallow = all
> allow = gsm
> allow = ulaw
> allow = alaw
>
> Snom phone is configured to use GSM as default codec but with "Offer
> Answer/Full" option set.
>
> If I place a call FROM the Snom phone to an external number (going out of
> the CAPI/Fritz/ISDN interface) everything works beautifully - and
> "sip show
> channels" show that the Snom phone is using GSM.
>
> If a call come IN on the Capi interface and is routed to the
> phone there is
> the described pulsating sound heard on the Snom phone alone and "sip show
> channels" report that ALAW is being used as codec.  How come the choice of
> codec is different?  AFAIK when gsm is first in sip.conf this
> should be the
> preferred codec.
>
> I haven't tried to roll back to an earlier Snom image (using
> 2.05d) but this
> problem is definitely a new one.  Using an Asterisk CVS-HEAD as of today.
>
> So - I am not sure exactly where this bug is.  As far as I can see there
> might be two problems - one that the codec of my choice is not
> the one being
> used.  Second the pulsating noice when using ALAW (which should work fine
> too).
>
> Any ideas?
>
> Regards,
>
> 	Lars....
>
> > -----Original Message-----
> > From: asterisk-users-admin at lists.digium.com
> > [mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Lars Boegild
> > Thomsen
> > Sent: 18 May 2004 12:00
> > To: Asterisk-Users at Lists. Digium. Com
> > Subject: [Asterisk-Users] Problems w. chan_capi + ztdummy
> >
> >
> > Hi Everybody
> >
> > I've got a weird problem.  I am running one Asterisk system on a dual
> > processor box.  This box mostly do VoIP only but it has a Fritz PCI ISDN
> > card installed with latest drivers.  Dialing out through the ISDN
> > cards from
> > an internal Snom phone works fine and so does dialing in.  Except - if I
> > load the ztdummy module (for IAX channels) the capi drivers
> starts acting
> > up.  It is hard to describe the sound but it breaks up so badly
> that it is
> > impossible to understand the voice prompts and they also start playing
> > extremely slow (demo congrats alone takes more than 30 seconds
> > before going
> > to the next prompt in the standard demo setup).
> >
> > I am nearly updating this particular box every day and within the last
> > couple of days something else has happened.  When dialing OUT
> on the ISDN
> > card everything works fine.  When someone dial IN through the card and
> > connect to the internal Snom phone there is a pulsating background noice
> > that can only be heard on the VoIP phone.  From outside (the
> ISDN) things
> > sound perfect - from inside you can still hear what is being said - but
> > there is that pulsating quite high noice.
> >
> > Any ideas?
> >
> > Regards,
> >
> >     Lars...
> >
> > --
> > Lars Boegild Thomsen
> > Technical Director
> > JustIT Sdn. Bhd.
> > Cell Phone (MY): +60 (16) 323 1999
> > ICQ: 6478559
> > Yahoo Chat: lars_boegild_thomsen at yahoo.com
> > MSN Chat: lars_boegild_thomsen at hotmail.com
> > http://www.justit.ws
> > Phone: +1 (360) 515 3551 (US) +45 8692 1951 (DK) +60 (3) 2057 2646 (MY)
> > Fax  : +60 (3) 2057 2647 (MY)
> >
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