Planning and Installation Guide
Physical Extension A common internal extension with an assigned physical port and
Prompt For an auto-attendant menu, the result of playing (concatenating) a series of
phrases together.
PSTN Public Switched Telephone Network; another name for the public telephone network.
Remote Caller See Caller.
Ringback Tone The audible signal given to the caller by the telephone company (or
telephone system) to indicate that the remote telephone is ringing.
RJ-11 Registered Jack number 11; one of the series of registered jacks and cabling developed
originally by AT&T to standardize the cabling between the telephone and the telephone
company lines.
Service Provider Interface (SPI) An interface between the operating system and the telephone
Status Bar A text and mini-graphics area, usually at the bottom of a software application
window, that is normally used for showing the status of the application or other pertinent
Stutter Tone An intermittent dial tone provided by the telephone system (as opposed to the
usual constant dial tone); sometimes used to indicate to the user that there are messages in
his or her voice mailbox or that a feature (such as call forwarding) is enabled.
T-1 A digital transmission link with a capacity of 1.554 Mbps (1,544,000 bits per second). A
T-1 trunk can normally handle 24 voice conversations, each digitized at 64 Kbps. T-1 lines
are used for connecting networks across remote distances.
Telc o An abbreviation for telephone company.
Telephony Application Programming Interface (TAPI) A telephony software interface included
in Microsoft Windows 95, 98, and NT; the operating system that lets applications
incorporate telephony control.
Tip and Ring Telephony jargon for the two wires from the telephone system to the telephone
set; also indicates polarity
Trunk Sometimes used synonymously with line or CO line. Traditionally, a trunk from the
telephone company connects to a PBX only, and not to a telephone, whereas a line from the
telephone company connects to a telephone. For documentation purposes, either term can
be used when referring to voice connections from the telephone company.
Trunk Hunt Group A term sometimes used to indicate a group of telephone lines configured
by the telephone company to rotate incoming calls among all the lines in search of the next
available one. In this way, a company can give out one main number, and all calls to that
number will hunt for the next available line or trunk.
TUI Telephone User Interface; a set of defined keystrokes on the telephone keypad that are
used to execute commands to either the telephony switch, voice mail, or the automated
Workstation A personal computer (PC) or similar computer.
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