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

[Kristof Jozsa]

Found out what's wrong, maybe it can help others.. my linux's package manager 
automatically pulled the most fresh version of asterisk, 1.2beta. Downgrading to 
1.0.8 solved all problems described below, I get excellent quality and no noise now.

cheers,

Kristof

Kristof Jozsa wrote:
> 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
> 
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