OK, I’m trying to see if I can’t pull this off with asterisk:
I’m working for a company with 4 offices in different states and cities.
Each office has a Windows 2003 domain server. The servers are not connected, there is no VPN or anything. Each office has an existing PSTN. With this PSTN they can call intra-office free of charge, dial 9, and get an outside line. Calls between offices are NOT free…
Now, I realize that I will have to set up a VPN between the 4. Instate a Forest/tree domain relationship, etc.
All the offices have 1mb+ lines that are not too congested at the worst of times.
Can I use Aterisk to set up a way for the employess to call any other employee over with SIP free of charge, and still be able to call outside lines (with an extension like 9’) like before, at normal rates?