I have been forced into a project that requires us to migrate our current phone system to an IP PBX system. Currently we run off of analog lines and only have about 4 lines running into our office. We are in the process of building a new building and will have a major increase in lines. Here is our break down and would like to see what the best way of going about solution. Currently looking at Fonality and Intuitive Voice for PBX system and SIP coming in. We have a chamber of commerce that is going to build an business incubator for about 50 small (1 -3 employees) startup companies, Conference Room (1), Receptionist Area (1), Visitor Phone (1) and Chamber office phones (4). Each office is going to have its own number (DID) plus extension for inter office calling. When they call out the will use their own DID. Not sure on Call Sessions as we don't know how many companies are coming in (maybe 20 to start). We are going to have 1 - T1 to start out but will increase to a second T1 if necessary for bandwidth. We will be using Polycom phones IP331, IP550, IP6000
Any advise will be helpful in getting this project started.