A method and system for interworking between communications equipment based on different protocols allows communications service providers to use more than one technology in their networks. For example, Mobile Application Part (MAP) messages of TIA-41 are interworked to corresponding messages of the Global System for Mobile Communication (GSM), and GSM MAP messages are interworked to corresponding TIA-41 MAP messages. An inter technology bridge translates location and routing messages between, for example, an originating mobile switching center (MSC) based on a first technology (e.g., TIA-41 or GSM) and a home location register (HLR) based on a second technology (e.g., GSM or TIA-41). The ITB may include one or more databases for storing information useful for generating attributes or parameters required in an output message that cannot be directly generated from information supplied in an associated input message.