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2. List of VoIP companies - Wikipedia

   en.wikipedia.org/wiki/List_of_VoIP_companies

   DSL, ISDN, Wireless, and VoIP products for communications devices BigAir: Sydney: Australia: DSL services and Australia's National Broadband Network CallFire: Santa Monica: United States: Web-based VoIP Comwave: Toronto: Canada: Web and Mobile applications, VoIP telephone service, broadband internet providers, and commercial telecommunication ...

3. Cloud communications - Wikipedia

   en.wikipedia.org/wiki/Cloud_communications

   Cloud services is a broad term, referring primarily to data-center-hosted services that are run and accessed over an Internet infrastructure. Until recently, these services have been data-centric, but with the evolution of VoIP (voice over Internet protocol), voice has become part of the cloud phenomenon. [1]

4. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   Avaya Application Server 5300 (AS5300), JITC certified ASSIP VoIP; Bicom Systems IP PBX for telecoms; Brekeke PBX, SIP PBX for service providers and enterprises; Cisco SIP Proxy Server, Cisco unified border element (CUBE), Cisco Unified Communication Manager (CUCM) CommuniGate Pro, virtualized PBX for IP Centrex hosting, voicemail services ...

5. Internet Telephony Services Providers' Association - Wikipedia

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

   Adherence to the ITSPA Code of Practice and Best Practice Guidance documents Evidence that their platform design is resilient and that they deliver a reliable service, which will be measured by ITSPA as 99.99% availability between 8am & 8pm Monday-Friday, using the VoIP Spear monitoring platform.

6. List of mobile network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_network...

   The top five wireless providers operate nationwide wireless networks which cover most of the population in the United States, while smaller carriers provide native network coverage across selected regions of the United States while supplementing nationwide coverage through roaming agreements with other carriers.

7. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   The VoIP E911 emergency-calling system associates a physical address with the calling party's telephone number. All VoIP providers that provide access to the public switched telephone network are required to implement E911, a service for which the subscriber may be charged. "VoIP providers may not allow customers to opt-out of 911 service."