A virtual number, also known as DID or access number, is a telephone number without a directly associated telephone line. Usually these numbers are programmed to forward incoming calls to one of the pre-set telephone numbers chosen by the client; either Fixed, Mobile or VoIP. A virtual number can work like a gateway between traditional calls (PSTN) and VOIP.
Subscribers to virtual numbers may use their existing phones, without the need to purchase additional hardware. A Virtual Private Number is a telephone number that forwards incoming calls to any of a number of pre-set telephone numbers. These are also called a follow-me number, a virtual telephone number or Personal Number.
Usually a virtual telephone number can be set to forward calls to different telephone numbers depending on the time of day and the day of the week; for example, between 9-5 on working days incoming calls will be forwarded to one's workplace, but in the weekends to one's cellphone.
The availability (and acceptable use) of Virtual Phone Numbers is subject to the regulatory situation in the issuing country.
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