[Asterisk-Users] ISDN Hardware

[Uwe Betz]

Have a look at http://www.sirrix.de/content/pages/pci4s0.htm
Currently they don't have an english website but in short this card 
offers 4 Ports (8 Channels) and you are able to define the mode for each 
channel (PtmP, PtP, TE, NT) on your own. They have asterisk-drivers 
available (for Kernel 2.4) and what is very interesting about this card 
is, that if you have ISDN-Telephones in your environment you can connect 
them not only ti the astersik but when there is a connecten ISDN 
(internal) --> asterisk --> ISDN (external) then this will happen 
without asterisk beeing directly involved because these calls are 
connected through on the hardware without any echo-problems from 
transcoding the audio. All asterisk features are usable with this card 
including Fax based on spanDSP.

The price is at around EUR 500,-

Jui

Jeff Lists wrote:
> I have a test install set up as follows
> 
> Grandstream 102 ---- Asterisk ---- X100P ---- Adtran Express 3000 ---
> ISDN line to PSTN
> 
> Most things I want to do work fine except I do have some intermittent
> problems with an echo.  I am assuming that this is created in the link
> between the X100P and the Adtran terminal adaptor.
> 
> I am not sure of the proper terms but on the PSTN side of the Adtran
> there is one pair of wires which carry two channels.  On the interior
> side of the Adtran there are two pairs of wires which each carry one
> channel (is this a BRI channel??).
> 
> In the final install I will be replacing the X100P with some type of
> ISDN card.  I currently have three ISDN pairs which create six lines. 
> I would like to get enough hardware to be able to add one more pair of
> lines soon.
> 
> My question is what type of ISDN card do I need?
> Will this replace the Adtran or plug into it?
> Since this is all digital is it a safe assumption that my echo
> problems will be gone?
> 
> Thanks,
> Jeff
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