AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 55

Introduction
A combination of up to 10 ICOM Voice, ICOM Ring , and ICOM Originate
Only buttons can be assigned to each telephone, except for single-line
telephones, on buttons 1 through 10. See System Planning for button
diagrams. The number of Prime Line buttons that can be assigned to a
telephone is limited only by the number of trunks in the system and the number
of buttons available on the telephone.
In Behind Switch mode, users have access to the special features of both the
Behind Switch system and the host system. When both systems have common
features, the customer must decide which system will be used for those features
through system programming, A fixed Conference, Drop, or Transfer button
automatically activates that feature on the host system. A user can program an
unlabeled button for any of those features to access that feature on the Behind
Switch system. Each system must be programmed accordingly, and the users
must be given the appropriate access instructions.
When users press a fixed Conference, Drop, or Transfer button, the
respective host features are activated: a timed switchhook flash is sent to the
host, followed by a programmed feature access code. The person
programming the system must obtain the feature access code for the host
system and program it to the appropriate button.
NOTE:
A single-line telephone user has access only to the host system's
Conference, Drop, and Transfer features.
Behind Switch Considerations
Behind Switch mode is appropriate for users who are part of a large
organization. For example, a department might not want (or be able) to support
a large-capacity PBX. Programming the communications system for Behind
Switch operation provides the advantage of the host's features and capabilities.
A business with multiple locations can use Centrex services to provide the
appearance of a single system at all locations.
FCC Registration
The account representative or authorized dealer who planned the system's
mode of operation provides the FCC registration number that the customer
reports to the local telephone company. Depending on mode of operation and
the hardware strap in the processor module, this number includes the letters
KF, MF, or PF, loosely corresponding to "key function," "multi-function," or "PBX
function, " respectively. (The FCC has no Behind Switch classification. )
Modes of Operation 1-27