Nortel Meridian M1250 User Manual page 45

Introduction
Speed Call codes
A Speed Call code is used to instruct the system to dial a programmed number automatically. The list of
telephone numbers that have been assigned codes to be used with the Speed Call feature is created by
the Speed Call Controller.
SPRE codes
A Special Prefix (SPRE) code is one to four digits that is assigned by your System Administrator. You use
a SPRE code to operate a feature for which your console has no dedicated (programmed) feature key.
Definitions of telephonic terms
Listed Directory Number (LDN)
X11 release 20 and later allows up to six LDNs. Previous releases allow up to four. When Network
Attendant Services (NAS) is enabled, the LDNs are recognized across the network.
Loop
A loop is a line that comes to the console, over which calls can be extended.
Night Service
When all consoles are unattended, the system is put into Night Service. This routes all incoming calls to
a destination other than the consoles, to a Night Service extension, where callers may hear a
recorded message.
Trunk group
A trunk group is a group of telephone lines of a certain type (public, WATS, Tie, and so on).
Networking
Two types of networks are discussed in this document. ESN is Electronic Switched Network and ISDN is
Integrated Services Digital Network.
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