A communication system has a cellular telephony interface in individual ones of two or more mobile vehicles, a position determination system in individual ones of the mobile vehicles, a network of cellular base stations coupled to the mobile vehicles, individual base stations coupled to one or both of a packet-switched or a line-switched telephony system, a router coupled to the base stations and enabled to retrieve GPS position from the telephony events, and a plurality of service centers coupled to one or both of the telephony systems. Telephony events from individual ones of the mobile vehicles are routed according to position reported by the position determination system.