VOICE OVER ip ON Leased Line

We plan to implement a VPN via DSL and want to use VOiP .  Can we use ordinary PBX equipment to share the VOip line to our various extensions?
grillsterAsked:
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lrmooreCommented:
If you have analog connections, yes.

Caution: you do not get any guaranteed quality of service over DSL.
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grillsterAuthor Commented:
Irmoore I dont quite get what you mean by analogue connections.
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epylkoCommented:
As long as you have IP connectivity, you can do voice over it.

Because you have a DSL line, you may or may not get a reliable quality of service from your DSL provider.

Your PBX might have IP enabled cards that you would have to get, such as Nortel's Internet Telephony Gateway (ITG) line or trunk cards.  Or, if your PBX does not have a native IP interface, you can use analog trunks or lines into something like a Cisco router.

So, the answer is yes but the solution depends on your equipment and what exactly you are trying to do.
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grillsterAuthor Commented:
Hi epylko, Our pbx does not have a native IP interface, We will have a Cisco 2600 router and we are trying to do voice between towns.  Each town office will have a DSL link as part of a VPN.



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lrmooreCommented:
Does your pbx have an analog trunk port? An example of an analog line would be for a fax machine.
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grillsterAuthor Commented:
What we do is we connect the fax as an extension.  So I guess yes we can connect analog devices.  Is this what you meant.

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epylkoCommented:
You will need an NM-1V or NM-2V in each 2600 router, as well as VIC-2FXS for station equipment and a VIC-2FXO for the connection to the PBX.  Also, don't forget the appropriate IOS upgrade.  You might want to consider a voice-enabled 1760 router - it might be more cost effective for you.

Here's one design example from Cisco: http://www.cisco.com/en/US/tech/tk652/tk701/technologies_configuration_example09186a00800942a5.shtml

-Eric
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