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Yes, it can be done.
You will need:
1) Asterisk
server
2) ATA devices (
recommended: Linksys PAP2-NA - 1 device for every two lines connected to
the PBX)
3) An appropriate amount
of time to become familiar with Asterisk and the ATA devices
You could use Cisco ATAs... but they are expensive
and hard to configure... I would recommend using Linksys PAP2-NA (ok.. so
technically these are now cisco ATAs... but we won't get into that) as they are
cheap, reliable, configurable and relatively easy to set up. A simple setup can
be done for less than $200USD if you already have a computer that you
can use for the Asterisk server. The computer can be an just abount any old
computer (P2 or better) to get started and experiment with.
Your setup would be an ATA connected to each PBX.
Each ATA would register to the Asterisk server at the main office. You will need
to reconfigure each PBX to send calls to the other two systems out through the
analog line connected to the ATA, and configure the asterisk server to send the
calls to the other systems as appropriate.
Before you start, go to the Wiki (http://www.voip-info.org/tiki-index.php?page=Asterisk)
and read... then read some more... when you feel that you've read enough to have
the basic idea of what Asterisk is and what it does... read it again.
Organize the information you will need to design
the system... This means:
1) Gather the dialplan
information for all the office PBX systems. You will need to determine a way to
integrate the dialplans from all the systems so that you can dial from one
system to the others. This can be done in any number of ways and you will have
to decide on the best way to do it to meet your specific needs
2) Gather the information you
need to configure the ATA devices
3) Gather the information about
the internet connections at each location. Pay specific attention to any
firewalls you will have on the network
4) plan a dialplan for the
Asterisk server
5) install your chosen operation
system on the computer
6) download and compile
Asterisk
7) comfigure your Asterisk
server. using the information gathered steps 1, 2, and 3 to guide your
decisions
8) configure your ATA
devices
9) test your system before you
deploy the ATA devices, using a phone set to "emulate" the pbx(s).
10) deploy the
system
Good luck. 8-}
Regards,
Derek Bruce
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