Abstract: A system and method of providing seamless interoperability for a mobile station roaming between cellular telecommunication systems operating in multiple hyperbands such as the 1900-MHz PCS hyperband and the 800-MHz cellular telephone hyperband, utilizing United States cellular standards. An enhanced inter-exchange communications protocol based on IS-41 is utilized to communicate information required for seamless interoperability between mobile switching centers (MSCs). The enhanced inter-exchange communications protocol comprises a plurality of signaling messages and a plurality of modified message parameters within the signaling messages. The modified message parameters are modified to include information elements required for seamless interoperability between the multi-hyperband capable exchanges and are added as optional (overriding) parameters to the signaling messages.

Abstract: A data communication interface for interfacing between a digital radio telephone and computer includes a first protocol converter for converting forward channel data from the telephone into a form usable by the computer and a second protocol converter for converting reverse channel data from the computer into a form usable by the telephone. The digital telephone produces a plurality of status signals indicating the operating states of the telephone. The interface receives each status signal from the telephone and stores it in a status memory. When a command signal is received from the computer, the interface makes a search through the status memory for one corresponding to the received command signal. The detected status signal is applied to the computer and displayed.