I would use a device such as a Quintum AXG-2400, or an Adtran 924, or even
an Audiocodes M124 which all are 24 port FXS to SIP gateways. depending on
your requirements some or all of these devices can support dial 9 second
dialtone, message waiting, Multiple SIP servers, etc.. plus the connect to
the NETWORK not by USB. so that you can physically place them wherever your
cabling closet may be and sometimes reduce the amount of copper needed in
the building as not all the gateways need be together as long as they are on
the network...
-Christopher
From: Ioan Indreias [mailto:ioan.indre...@modulo.ro]
Sent: Monday, January 26, 2009 7:50 AM
To: AstLinux Users Mailing List
Subject: Re: [Astlinux-users] Advice on hardware
Hi Tom,
Please be advised that running 72 FXS is a "power killer" requirement. FXS
lines have to provide the power to the analog phones and you have to use a
good/big power supply inside your PBX (verify that you have enough cables
and reserve to power your FXS cards from the internal PSU) - OR - you have
to use external power supplies for the FXS cards.
I can assure that you could ran Analog cards with PRI cards inside an
Asterisk box (we have such a mix into our office) but the problem is not
here.
The issue it is that you have a requirement for 72 FXS extensions. Both
Digium and Sangoma offer cards with maximum 24 analog ports. Same for Rhino.
Thus you will end with 3 analog cards + 1 PRI card. which will put a high
load on your server due to high volume of interrupts generated. The ideal
scenario is to have each card using an unshared interrupt - and I am not
sure if you could obtain this. Having more than 2 cards in one machine could
create problems.
Thus, my recommendation (for 72 FXS) is to use one of the following
solutions:
1. PRI card with one channel and
a. change the requirements for 72 FXS into 72 VoIP phones and use
Ethernet
b. Xorcom (3 Astribank x 24 FXS) connected to the PBX by USB cables
(and an USB hub in case you do not have enough ports)
c. ATA adapters (like 3 x VigorTalk ATA-24) connected to the PBX by
Ehternet
2. PRI card with 4 channels (one for Telco and 3 for each media gateway) +
Analog to Digital media gateways (3x24 units)
Regarding 3xFXO you could easy put add to the PRI card an Analog card
with 3 or 4 FXO channels. Or you could use an Astribannk of 24 FXS + 8 FXO
(and use only 3 FXO lines)....
I'm not sure which of the mentioned scenarios could be "powered" by a
net5501 (my feeling is that none - but maybe I'm too pessimistic) and I'll
let other forum-colleagues to share their knowledge.
Hope that helps,
Ioan Indreias.
On 26-Jan-09 12:33 PM, Tom Chadwin wrote:
I would recommend to use the Mediatrix 1124 24 FXS ports gateway.
Would this not work out more expensive than getting some internal
cards? I've used Digium and OpenVox ones, but would people recommend
something else as being more reliable/better quality (Sangoma/Rhino?).
If I put three 24-port PCI cards in, that would give me plenty of
capacity.
Not sure the Net 5501 can handle a full PRI-T1 card.
Can anyone confirm this? Can the net5501 handle a PRI card?
I'm not sure if you can mix
PRI-T1 cards with BRI or analog cards on the same system.
Again, can anyone confirm? I have set-ups with BRI and analogue, but
are you saying that PRI and analogue might not work together?
So, if I am trying to build a system with, say, 72 FXS, 3 FXO, and a
PRI, preferably running off CF, does anyone have any hardware
recommendations?
Thanks
Tom
Tom Chadwin wrote:
I've been setting up some remote offices with net5501s, containing a
combination of TDM cards for POTS lines and ISDN BRI cards. I'm using
Snom SIP phones.
Our head office requires a bit more thought. It currently has an ISDN
PRI and three analogue lines, which I could handle in the same way as
the other sites (assuming the 5501's CPU is powerful enough to run a
PRI), but it also has around 60 phones. Replacing all of these with
SIP handsets would be extremely expensive. The CF-card approach of
Astlinux appeals to me, so what hardware would people recommend for
Astlinux to connect to all of the above?
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