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Voice over Internet Protocol ( VoIP [a] ), also called IP telephony, is a method and group of technologies for voice calls for the delivery of voice communication sessions over Internet Protocol (IP) networks, [2] such as the Internet. The broader terms Internet telephony, broadband telephony, and broadband phone service specifically refer to ...
179xx + target number followed – VoIP (e.g. 17901-133-0000-0000, 1790 for China Telecom, 1791 for China Unicom, and 1795 for China Mobile) 400 xxx xxxx, 800 xxx xxxx – business numbers
A virtual number, also known as direct inward dialing (DID) or access numbers, 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: fixed, mobile or VoIP .
Voicemail. A voicemail system (also known as voice message or voice bank) is a computer-based system that allows people to leave a recorded message when the recipient is unable to answer the phone. The caller is prompted to leave a message and the recipient can retrieve said message at a later time.