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- In integrated services digital networks (ISDN), an interactive telecommunications service that provides for information interchange among users by means of store-and-forward, electronic mail, or message-handling functions. Synonym [loosely] electronic messaging service.
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- application association, bearer service, conversational service, D channel, digital data service (DDS), distribution service, integrated services digital network, interactive service, retrieval service, service identification, teleaction service, transmission service channel, U interface