[Asterisk-Users] PRI Bridging and Recording

[Steve Rawlings]

Hi all,

Rob, you say you've fitted an ISDNGuard, I've been trying to get some 
definitive answers on it's connectivity for a while without sucsess.  Could 
you do me a favour and confirm if our ideas are possible ( I think they are, 
I just need confirming before we buy one, tried Junghanns direct and no 
response, although the install guide suggests it should work how we want).

We want to put our Asterisk in front of our PBX, connected by PRI's (2 x UK 
BT ISDN30).  We have a TE405P configured with spans 1 and 3 as PRI_CPE 
connected to the ISDN and 2 and 4 as PRI_NET connected to the PBX.  The 
dialplan simply passes all calls straight through, ie span 1 to span 3, span 
2 to span 4, works the same in the other direction from the PBX, span 3 to 
span 1 and span 4 to span 2.  Works great, no problems.

What I'd like to do is have the ISDNGuard in front of Asterisk as a backup 
as follows for normal operation -

ISDN NTE > PRI cable to ISDNGuard NET port > internal connection to 
ISDNGuard * CPE port > PRI cable to TE405P Span 1 PRI_CPE > internal 
connection to TE405P span 2 PRI_NET > PRI cable to ISDNGuard * NET port > 
internal connection to ISDNGuard PBX CPE port > PRI cable to PBX.  We'd do 
this for each of our 2 PRI connections.

When the Asterisk or ISDNGuard fails, ISDN NTE > PRI cable to ISDNGuard Net 
port > internal connection to ISDNGuard PBX CPE port > PRI cable to PBX.

Many thanks,

Steve


----- Original Message ----- 
From: Rob Lith
To: Asterisk Users Mailing List - Non-Commercial Discussion
Sent: Wednesday, February 08, 2006 6:17 PM
Subject: Re: [Asterisk-Users] PRI Bridging and Recording


Garth

In Cape Town we're assisting at a site where we have two PRI's coming in 
from Telkom and going out to a legacy PBX, CPU is a 2.8Ghz the card is a 
Digium TE406P so that the echo cancellation is handled by the hardware 
rather than server. Monitoring is at teh channel level and with Asterisk 1.2 
you should look at MixMonitor record audio & mix natively as the call is in 
progress to avoid the need to spawn external processes which will cause cpu 
usage spikes.

The set-up has to be in serial, you can't 'vampie' the lines. So this is 
potentially a point of failure so we install the Junghanns ISDNguard that 
can take in four BRI or PRI and send our four to an Asterisk server and four 
to a back up device. A serial connection listens for a heart beat on the 
Asteirsk server and switches over on failure.

Regards
Rob


On 2/8/06, Garth van Sittert <garth at bitco.co.za> wrote:
Hi All

Does anyone have any ideas around what processing power is needed when
bridging PRI channels and recording?
I am not sure how the bridging takes place with and without recording?
I basically have a situation like this:

        Telko <----> Asterisk <-----> Legacy PBX

Where the lines are PRI's between Telko and Asterisk and Asterisk and
the Legacy PBX.
At what level does bridging happen? Do the streams get passed directly
between to two PRI ports?  How would recording effect this?  Tap into
the streams etc?
If someone could explain a bit more on the architecture around this,
that would be great.

Thanks
Garth

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