Connecting a standard PBX to a VoIP gateway for inter-office calls.
In each of our three offices we currently have installed a standard digital Nortel Norstar PBX. Each PBX has 8 to 12 analog FXS lines to the PSTN and roughly 30 phones.
We would like to be able to make inta-office phone calls over the internet to reduce our LD costs.
My idea is to connect some of these FXS lines to a VoIP gateway so that we can call the other office by dialing some kind of prefix (like *21 for location 1 or *22 for location 2) and then the phone extension in that location.
I am comfortable on the IP side of this solution but not as much on the PBX side so I am trying to understand what are the things I should look for.
- can I still use these analog lines on the PBX or I should go with a T1 interface?
- How do you actually configure a Norstar PBX. Is this something I would be able to do myself or I should use some outside vendor?
- I can't find any Norstar user guides that easily explain how to configure these systems.
- numbering plan. is*xx a good way to identify the remote offices or I should do it some other way?
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