[Asterisk-Users] [Fwd: Eicon Diva 2.01 S/T PCI quality problems]

[Kristof Jozsa]

Hi all,

I'm experimenting with Asterisk on linux using an Eicon Diva 2.01 S/T PCI card.
I'd set up the card using the hisax driver and isdn4linux (titled as "Old
ISDN4Linux (obsolete)" in the 2.6.12 kernel. I can make SIP calls and outgoing
phone calls as well, but gathered a few problems on my way:

1. Plain SIP calls using softphones on windows clients work fine not counting
the delay I'm experimenting. We talk about 1-1.5 secs delay in the speech which
is rather distrubing (no noise in the line though).

2. Outgoing calls eg. to my mobile phone has some more serious problems. Speech
quality on my mobile phone is excellent. However, sound quality on the asterisk
console machine where I dialled from is about unacceptable. It has about 90%
static noise and about 10% speech somewhere in the middle. I have the same
experience calling from a windows softphone through asterisk to my handy, maybe
a little less noise (around 80%).

So my questions would be: can I do anything with the issues described above? Is
it a hardware problem (eg. I need to replace the old and cheap card to a more
modern one)? Maybe it's a driver problem (eg. the hisax driver is known to work
only with such extreme static noise)? I also don't really understand why the
static appears only on the server side and not on the called side.

Any help or suggestions are much appreciated,
thanks very much in advance.

Kristof Jozsa