Alcatel Carrier Internetworking Solutions OmniPCX 3AK 19522 - Manual (Page 60)

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SINGLE-LLINE TTERMINAL
A phone which has one line available to it (no line keys).
SYSTEM D DIRECTORY
A directory containing all the abbreviated numbers available to all users within the
company.
SUB-A ADDRESS
To contact your correspondent's fax, PC or phone, you may need to add a four-digit
"sub-address" to his number.
UNASSIGNED N NIGH T C CALLS
This facility enables you to answer incoming calls when the switchboard is not attended
(General bell).