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Terminal Adapter

Allows existing non-ISDN terminals to operate on ISDN lines. It provides conversion between a non-ISDN terminal device and the ISDN user/network interface.

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Tandem

An exchange used to switch network traffic between other nodes.

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TAC

Trunk Access Class

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TAPI

Telephony Applications Programmers Interface
 - A standard for CTI developed by Microsoft and Intel associated with PC based computer systems. It is an open standard which permits the direct control of a telephone from a windows based application.

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TCP/IP

Transport Control Protocol/Internet Protocol

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Terminal Equipment Type 1

ISDN-compatible terminals. A TE1 can be an ISDN telephone, a personal computer capable of working with ISDN, a video-phone etc any device that can attach to and work with ISDN.