Mitel 5540 IP Console - User Guide
LDN Keys (Listed Directory Number)
PABX (Private Automatic Branch Exchange)
Telephone switching system for private use by a company.
Recall
A call which returns to the console after being transferred to a busy or unanswered extension.
Software
The routines, programs, and instructions required to run the system.
Trunk
A trunk (outside line) is the external communications link between two switching systems. This link can be between one or more telephone systems (PABXs) or the PABX and Central Office equipment.
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