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2. Virtual number - Wikipedia

   en.wikipedia.org/wiki/Virtual_number

   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. A virtual number can work like a gateway between ...

3. Google Voice - Wikipedia

   en.wikipedia.org/wiki/Google_Voice

   Website. voice .google .com. Google Voice is a telephone service that provides a U.S. phone number to Google Account customers [ 1] in the U.S. and Google Workspace (G Suite by October 2020 [ 2]) customers in Canada, Denmark, France, the Netherlands, Portugal, Spain, Sweden, Switzerland, the United Kingdom and the contiguous United States. [ 3]

4. E.164 - Wikipedia

   en.wikipedia.org/wiki/E.164

   E.164 is an international standard ( ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks . E.164 defines a general format for international telephone numbers.

5. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   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 ...

6. Interactive voice response - Wikipedia

   en.wikipedia.org/wiki/Interactive_voice_response

   Interactive voice response. Interactive voice response ( IVR) is a technology that allows telephone users to interact with a computer-operated telephone system through the use of voice and DTMF tones input with a keypad. In telephony, IVR allows customers to interact with a company's host system via a telephone keypad or by speech recognition ...

7. List of country calling codes - Wikipedia

   en.wikipedia.org/wiki/List_of_country_calling_codes

   Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.

8. Public switched telephone network - Wikipedia

   en.wikipedia.org/wiki/Public_switched_telephone...

   The public switched telephone network ( PSTN) is the aggregate of the world's telephone networks that are operated by national, regional, or local telephony operators. It provides infrastructure and services for public telephony. The PSTN consists of telephone lines, fiber-optic cables, microwave transmission links, cellular networks ...

9. VoIP VPN - Wikipedia

   en.wikipedia.org/wiki/VoIP_VPN

   A VoIP VPN combines voice over IP and virtual private network technologies to offer a method for delivering secure voice.Because VoIP transmits digitized voice as a stream of data, the VoIP VPN solution accomplishes voice encryption quite simply, applying standard data-encryption mechanisms inherently available in the collection of protocols used to implement a VPN.