Busy Lamp Field (BLF)
Allows users tracking the condition of the other telephone or the subscriber, for example, there will appear a signal on the screen of the telephone device informing that the subscriber is on the line and is temporarily unavailable.
An opportunity to use the other connection line if the usual line is engaged.
Luminet
Offers connections ranging from capability for a couple of simultaneous calls for small PBX-equipped businesses to an unlimited number of channels for larger businesses.
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