telecommunications services, namely, ISDN services and personal communication services, telecommunications gateway services; audio and/or video teleconferencing; telephone communication services; cellular telephone services; electronic transmission of messages and data; electronic transmission of data and documents via computer terminals; electronic voice messaging, namely, recording storage, and subsequent transmission of voice messages by telephone; electronic mail services; facsimile transmission services; mobile radio communication services; delivery of messages by electronic transmission; outcall notification services; PBX dialing services; paging services; providing frame relay connectivity services for data transfer; voice-activated dialing services; wireless PBX services; wireless digital messaging services; and wireless facsimile mail services