Busy verification

In a public switched telephone network, busy verification: is a network-provided service feature that permits an attendant to verify the busy or idle state of station lines and to break into the conversation.

A 440 Hz tone is applied to the line for 2 seconds, followed by a 0.5 second burst every 10 seconds, to alert both parties that the attendant is connected to the circuit.

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Last updated on Wednesday December 13, 2006 at 06:15:06 PST (GMT -0800)
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Feature-transparent PBX networks: multiple PBX sites can be linked together and offer the same look and feel to both employees and outside callers. A look at how the technology works. (Distributed Communications System)

May 01, 1991; Feature-Transparent PBX Networks A growing number of private networks are being installed that support feature transparency...

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