call queuing

Secondary dial tones are often used in call queuing and call forwarding systems.

It may be that throughout the life of a call it "appears" several times at the same extension (such as with call queuing).

Clients are attracted to 084 and 087 numbers because per minute revenue is generated for them from each call, and call queuing is permitted.

Questions have been asked in the British House of Commons about how much money the UK government is receiving from call queuing on non-geographic numbers.

It is also likely that 0870 numbers will move to the same regime as 0871, 0872, 0873 (PhonepayPlus) as Premium numbers with call queuing permitted.

It is a 1G analog cellular standard that utilized non-audible in-band signaling, audio scrambling via band-inversion and cell network call queuing when congested.

(Even more of the public is aware of the huge costs of 09 Premium rate numbers, where prices have to be clearly indicated, and on which call queuing is specifically prohibited.)

This additional revenue may be shared with the subscriber, but is often used instead to subsidise additional network services, such as fax to email, virtual office applications, call queuing, voicemail and easy number redirection.

Around the same time, Dr. Leonard Kleinrock, who would preside over the establishment of the first node at U.C.L.A., was using a mathematical tool called queuing theory to understand how data would flow in a packet-switched network.