I am in the process of developing a network to integrate roughly 90 working ships with their headquarters. The goal is for each vessel to be essentially a small branch office, with 4 digit dialing to headquarters and the like.
On each vessel will be a 2900 series router, along with 2 to 3 IP phones plus one or two analog rugged phones for crew use, connected to an FXS card in the router. Connectivity to the outside world will be via a private satellite network, so there will be about 550ms delay over the link.
My question is whether I should just link the phones (and FXS ports) back to a Call Manager back at our teleport, or make each ship-board router a CME, and have that link back to a master system in the teleport. There will likely be little to no calling between phones on the vessel, and little vessel-to-vessel calling.