I’m putting together an Asterisk system as a pro bono project for a non-profit public-service firm. I’d like to describe what I’m planning and ask you all if it sounds practical.
They need 8 phone lines. For reasons that go way beyond the scope of this email, they can only have three lines (POTS) at their office. So, I’m contemplating a system that looks like this:
At their office: Asterisk PBX with Sangoma A200 card to connect the three POTS lines they have now. About a dozen IP phones in various offices and rooms will connect to this PBX via the LAN.
At the telco (an ISP that also provides telephone and co-location services): Another Asterisk PBX with Sangoma A101 card to connect to a fractional T1 with 8 bearer channels (the 5 they need now and 3 more for future expansion) and one data channel.
The two Asterisk systems are connected together over the public Internet.
The objective is that the two Asterisk systems work together as one, so that, for example, (1) someone could call in on one of the PRI / T1 lines at the ISP and the call would be routed to an office in the firm’s facility via the other PBX, or (2) people could call in to both PBXs via the phone lines connected to each, and participate in a conference call along with some people on the IP phones in the office.
Without getting into the details of how this is done (I’ll RTFM a lot, and figure it out, no doubt with the help of you fine experts here), does this sound like a practical way to do this, and well-supported by Asterisk if configured properly?