a feature that cuts down calling costs (particularly the cost of roaming). Once the PBX number is dialled, the PBX rejects the call. The PBX then returns the call immediately, and -upon receiving this return call- the client can dial any other number he or she wishes to be connected to.
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"Call Data Record - records of the call duration, dialled number, caller, the time of the call
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the routing of the signal of a specific bandwidth for the transfer of information, such as voice, data and video.