Asterisk Implementation-Multi-Office

This is one of THREE Asterisk / Red Hat Linux projects being undertaken. This Project: Multi-Office Asterisk Implementation. Data-Center: -- Intel based Server -- -- As required RAM, HD, CPU (you specify) -- -- PRI Card (feed from a central Adtran-800) -- -- -- Probably Sangoma A104 card (prefer over Digium cards) -- -- Also Connect to VOIP Service (Maybe NuFone) for toll-free inbound -- -- -- Cheaper toll-free inbound, quality may be issue. Branch 101: -- Intel based Server -- -- As required RAM, HD, CPU (you specify) -- -- One-Port local line card (config as 911 and Net-Down) -- -- -- Probably shared as local outbound Fax Line -- -- VOIP interchange with DataCenter server (secure (?VPN?)) -- -- Extensions 3610-3619 Branch 102: -- Intel based Server -- -- As required RAM, HD, CPU (you specify) -- -- One-Port local line card (config as 911 and Net-Down) -- -- -- Probably shared as local outbound Fax Line -- -- VOIP interchange with DataCenter server (secure (?VPN?)) -- -- Extensions 3620-3629 Branch 1xx: -- Future Growth template -- Modeled as above (all small offices) Integration ... -- 4-digit dialing within (Sub) servers not requiring connection to data center -- 4-digit dialing between all (sub)servers connected to DataCenter -- If Net-Down, send out thru local (911) PSTN port -- Voice Call director for calls to General Number. -- Meeting Room / Conference Call capability -- Voice Mail, and Call Transfers and small (3-party) conference calling -- Outbound calls through the Data Center Server / PRI -- Future potential use of outbound VOIP (NuFone) interface So, we want 3 servers configured on cost effective hardware using your expertise in these matters. It is important for us to find an individual whom we can work with (through this site) for out other 2 projects. The largest project is all IVR using PHP to interact with our MS-SQL Server doing validations and event recording and status updating. WE NEED YOUR EXPERT ADVICE !!! We don't want to reinvent this solution over and over.