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2. List of VoIP companies - Wikipedia

   en.wikipedia.org/wiki/List_of_VoIP_companies

   VoIP and mobile phone services sipservice: Winterthur: Switzerland: VoIP service provider TELES AG: Berlin: Germany: VoIP services VirtualPBX: San Jose, CA: United States: Cloud-based telephone systems VocalTec: West Palm Beach and Netanya: United States and Israel: Telecom equipment provider VoiceHost: London: United Kingdom: VoIP and DSL ...

3. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

4. Asterisk (PBX) - Wikipedia

   en.wikipedia.org/wiki/Asterisk_(PBX)

   Asterisk is a software implementation of a private branch exchange (PBX). In conjunction with suitable telephony hardware interfaces and network applications, Asterisk is used to establish and control telephone calls between telecommunication endpoints such as customary telephone sets, destinations on the public switched telephone network (PSTN) and devices or services on voice over Internet ...

5. Internet Telephony Services Providers' Association - Wikipedia

   en.wikipedia.org/wiki/Internet_Telephony_Services...

   Best VoIP CPE - Sangoma Technologies – NetBorder Lync Express; Best VoIP Infrastructure - Metaswitch Networks – Perimeta 3.3; Most Innovative VoIP Product - Voxhub – Voxtop Apps Platform; ITSPA Members' Pick - Mark Spencer (computer engineer) for developing Asterisk (PBX) Highly Commended. Best Consumer VoIP: BT Group

6. Telephone number mapping - Wikipedia

   en.wikipedia.org/wiki/Telephone_number_mapping

   Open Enum: An effort of mobile carriers and other parties involved in mobile numbering plans to generate complete, public database of all international numbering plan, available via public dns. Private ENUM: A carrier, VoIP operator or ISP may use ENUM techniques within its own networks, in the same way DNS is used internally to networks.

7. Internet telephony service provider - Wikipedia

   en.wikipedia.org/wiki/Internet_telephony_service...

   Retail customers of an ITSP may use traditional analog telephone sets attached to an analog telephony adapter (ATA) to connect to the service provider's network via a local area network, they may use an IP phone, or they may connect a private branch exchange (PBX) system to the service via media gateways.