[Asterisk-Users] audio delay ISDN

[Michiel van Baak]

Hello all.

Since half december we are trying to implement * as our primary PBX.
We had a test machine running with 2 sip phones and a single ISDN card.
Since this was working ok, we installed * on our main Debian server.
Some specs:
P4 2.8 Ghz HyperThreading
512 MB RAM
Debian Sid updated every week.
Linux 2.6.9 vanilla kernel (not the debian package)
1 Intel Pro 100 nic for internal network
2 ISDN cards (0000:00:0a.0 Network controller: Cologne Chip Designs GmbH ISDN network controller [HFC-PCI] (rev 02) )
The Hisax module is loading ok.

Now everything works ok. we managed to get a ok dialplan working for internal phones and all 8 phone numbers we have on the ISDN lines.
We have one annoying problem tho.
There is an audio delay on outgoing/incoming calls.
The delay is 2 to 3 seconds.

Internal calls from sip to sip is no problem at all.

Any idea what is wrong with our setup ?
If you need more info and/or config files please ask.

Met vriendelijke groet,

Michiel van Baak
Terrazur