asterisk users - May 2004 - 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@yahoo.com
MSN Chat: lars_boegild_thomsen@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)

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@lists.digium.com
> [mailto:asterisk-users-admin@lists.digium.com]On Behalf Of Lars Boegild
> Thomsen
> Sent: 18 May 2004 12:00
> To: Asterisk-Users@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@yahoo.com
> MSN Chat: lars_boegild_thomsen@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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> http://lists.digium.com/mailman/listinfo/asterisk-users
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>    http://lists.digium.com/mailman/listinfo/asterisk-users
>

There is some sort of support of G7231 in openh323?
I have seen a file in src but I think that there is only a interface not 
an implementation and this interface is using some itu files (free code 
 from itu).
Anyone using the G7231 in openh323?

Cristian VASILIU
   Programator Software Principal   AccessNET International SA
   Phone:   +40.21.231.86.60
   Fax:     +40.21.231.86.61
   Mobile:  +40.788.40.14.22
   E-mail:  cvasiliu@accessnet.ro
   Web:     cvasiliu.vn.home.ro