Nortel BCM 3.7, Manual

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T1
Digital carrier system or line that carries data at 1.544 Mb/s. These lines can be used to
connect systems on a private network. See also universal T1 Wide Area Network
(UTWAN).
tandem calling
On a private network, a node can pass a call to one or more nodes on the private network,
and then out to the PSTN of the appropriate remote node. This allows a business to reduce
long-distance call charges by having the number appear as if it came from the local
system. Each system must ensure that the appropriate remote access package is assigned
to the lines used for the private network, as the system sees calls from outside the system,
even if they come over private lines, as remote-access calls, and treats them accordingly.
tandem network
The private networking chapter describes how a tandem network is configured. A tandem
network is a group of systems that are linked, each to one or two other systems. For
instance if you have systems A, B, C, D, E and F, A is connected to B, B is connected to A
and C, C is connected to B and D, and so on. In this case, for a call to move from A to F,
which are not connected, the call routes through all the systems between the two.
TAPI
The Telephony Application Program Interface (TAPI) is a standard program interface that
lets you and your computer communicate over telephones or video phones to people or
phone-connected resources elsewhere in the world.
target line
These are internal system lines used only to answer incoming calls. These lines route calls
to specific telephones. A target line routes a call according to digits it receives from an
incoming trunk. Program target lines under Target lines (Services, Telephony Services,
Lines). Assign target lines to telephones under DN XXX, Line access, Line assignment.
(Services, Telephony Services, System DNs). The DID telephony profile automatically
assigns target lines to all telephone DNs. This profile is picked when your system is first
set up, when you program the Quick Start Wizard. You can configure target lines on more
than one telephone, or multiple times on one telephone. As soon as one call is answered,
the line becomes clear and can be picked up by a second telephone or a second line.
TAT
The Trunk Anti-tromboning (TAT) MCDN call-reroute feature works to find better routes
during a transfer of an active call. This feature acts to prevent unnecessary tandeming and
tromboning of trunks.
TCP/IP
Transmission Control Protocol/Internet Protocol (TCP/IP) is a language controlling
communication between computers on the Internet.