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<DIV><FONT face=Arial size=2>Yes, it can be done.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>You will need:</FONT></DIV>
<DIV><FONT face=Arial size=2> 1) Asterisk
server</FONT></DIV>
<DIV><FONT face=Arial size=2> 2) ATA devices (
recommended: Linksys PAP2-NA - 1 device for every two lines connected to
the PBX)</FONT></DIV>
<DIV><FONT face=Arial size=2> 3) An appropriate amount
of time to become familiar with Asterisk and the ATA devices</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>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.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>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.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Before you start, go to the Wiki (<A
href="http://www.voip-info.org/tiki-index.php?page=Asterisk">http://www.voip-info.org/tiki-index.php?page=Asterisk</A>)
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.
</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Organize the information you will need to design
the system... This means:</FONT></DIV>
<DIV><FONT face=Arial size=2> 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</FONT></DIV>
<DIV><FONT face=Arial size=2> 2) Gather the information you
need to configure the ATA devices</FONT></DIV>
<DIV><FONT face=Arial size=2> 3) Gather the information about
the internet connections at each location. Pay specific attention to any
firewalls you will have on the network</FONT></DIV>
<DIV><FONT face=Arial size=2> 4) plan a dialplan for the
Asterisk server</FONT></DIV>
<DIV><FONT face=Arial size=2> 5) install your chosen operation
system on the computer</FONT></DIV>
<DIV><FONT face=Arial size=2> 6) download and compile
Asterisk</FONT></DIV>
<DIV><FONT face=Arial size=2> 7) comfigure your Asterisk
server. using the information gathered steps 1, 2, and 3 to guide your
decisions</FONT></DIV>
<DIV><FONT face=Arial size=2> 8) configure your ATA
devices</FONT></DIV>
<DIV><FONT face=Arial size=2> 9) test your system before you
deploy the ATA devices, using a phone set to "emulate" the pbx(s).</FONT></DIV>
<DIV><FONT face=Arial size=2> 10) deploy the
system</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Good luck. 8-}</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Derek Bruce</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=shahan@lankabell.com href="mailto:shahan@lankabell.com">Shahan
Kalutanthri</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=asterisk-users@lists.digium.com
href="mailto:'asterisk-users@lists.digium.com'">'asterisk-users@lists.digium.com'</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, July 15, 2005 3:24 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Asterisk-Users]
Asterisk+errision PBX</DIV>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT><FONT
face=Arial size=2></FONT><FONT face=Arial size=2></FONT><BR></DIV>
<P><FONT face=Arial size=2>Dear All,</FONT> </P>
<P><FONT face=Arial size=2>I have a setup where three errision PBX's (head
office & 2 branch offices ) are @ three different location. Head of has a
errision BP250 where the branch officers has Errision BP50's.</FONT></P>
<P><FONT face=Arial size=2>I wana connect all three PBX's through IP link's.
My idea is to connect BP250 ( head office ) to asterisk. This has to be done
using analog interfacing coz there is no E1 / or T1 card's on BP250 and cost
is also a concern.</FONT></P>
<P><FONT face=Arial size=2>Can this be done ? And what kind of analog
interfaces I should use ?</FONT> </P>
<P><FONT face=Arial size=2>For branch office sides ( Errision BP 50 ), is it
possible to use some FXS interface ( ex : Cisco ATA etc ) and connect
that directly to the Errision BP 50, where the other end ( ex. Cisco ATA
IP side ) connected to the Asterisk @ Head office ?</FONT></P><BR>
<P><FONT face=Arial size=2>Thanks</FONT> <BR><FONT face=Arial
size=2>Shahan</FONT> </P><BR></BLOCKQUOTE></BODY></HTML>