Call whisper, otherwise known as call screening, is a calling feature that often appears on non-geographic telephony systems and hosted inbound call handling software.
It involves the playing of a message to the called party when they have answered a call, during which time the calling party continues to hear ringing. The called party can then decide whether to accept the call (usually by pressing a particular key whereupon the call will be put through to them) or to reject it (either by pressing a key or simply hanging up). They can also identify the caller by their caller ID number or answer the phone in an appropriate manner for the number that has been dialed.
Services such as call whisper messages have been shown to lower cost per call by 35% and reduce average waiting times between 12% and 43%.
Because call whisper settings are specific to a particular non-geographic telephone number, the feature can allow the called party to identify which telephone number the caller has dialed.
However, each of the ten numbers could have their own customised call whisper message on them relating to the nature of the call i.e. the function of the number that has been dialed.