MTSO - Computer Definition
In a cellular radio network, a switch that serves to interconnect fixed base station (BS) antennas and, thereby, to interconnect radio cells and the mobile stations (MSs) within them. See also antenna, BS, cell, cellular radio, MS, and switch.
(Mobile Telephone Switching Office) An operations center that connects the landline PSTN system to the mobile phone system. It is also responsible for compiling call information for billing and handing off calls from one cell to another.