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308 Glossary
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System speed dial code
A two-digit code (01 to 70) that you program to dial a telephone number a maximum of 24
digits long. You can program System speed dial codes for the complete system under the
System Speed heading.
T1
Digital carrier system or line that carries data at 1.544 Mb/s.
Target lines
Lines used only to answer incoming calls. A target line routes a call according to digits it
receives from an incoming trunk. You refer to target lines in the same way as physical
lines.
Telephony Application Program Interface (TAPI)
A standard program interface that allows communication over telephones or video phones
to people or phone-connected resources elsewhere in the world.
Transfer
A feature that allows you to redirect a call to another telephone in your Business
Communications Manager system, over a network, or outside your system.
Transmission Control Protocol/Internet Protocol (TCP/IP)
A language controlling communication between computers on the Internet.
TCP:
• checks packets of information for errors
• sends requests for re-transmission in the event of errors
• returns multiple packets of a message into the original sequence when the
message reaches its destination
IP:
• controls how packets are sent out over networks
• has a packet addressing method that allows any computer on the Internet forward
a packet to another computer that is a step or more nearer to the recipient
Trunk
The public telephone system or private network connection between the Business
Communications Manager system and the outside world.
Trunk media bay module
Physical units installed in a Business Communications Manager that connect the system to
the outside world.
User Speed Dial
Two-digit codes (71-94) programmed to dial external telephone numbers. These numbers
are available only at the telephone on which they are programmed.