Mitel 5550 - Manual (Page 71)

Reference
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Line
A telephone communications channel between switching centers
or the Central Office and the 3300 ICP.
Night Answer Point(s)
An extension user can answer incoming calls ringing the Night
Answer Point by dialing the TAFAS code.
Night Service
A system mode of operation that routes incoming calls to the
Night Answer Point(s) when the system is in Night Service and
the Attendant consoles are in Absent mode.
Pickup Group
Extensions located in one area, or with similar departmental
functions, are often placed in the same answer group.
Recall
A call returns to the console for further handling by the
attendant.
SMDR - Station Message Detail Recording
This is an application that automatically logs call information
such as “length of call” and “caller extension number”, among
other things.
Switchhook Flash
Used by extension users to signal the telephone system that they
want to activate a feature.
TAFAS Code
(Trunk Answer From Any Station) A code used to answer calls
ringing the Night Answer Point(s).
Trunk
An outside line which links two switching systems. This link can
be between one or more private telephone systems and/or
between your private system and the public telephone system
(Central Office).