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2. 10 Phone Systems for Small Businesses - AOL

   www.aol.com/10-phone-systems-small-businesses...

   Ready to upgrade your business communications? Start by comparing VoIP phone service providers.

3. Managed facilities-based voice network - Wikipedia

   en.wikipedia.org/wiki/Managed_facilities-based...

   According to NFPA 72 2010, 3.3.141, [1] an MFVN is defined simply as: A physical facilities-based network capable of transmitting real time signals with formats unchanged that is managed, operated, and maintained by the service provider to ensure service quality and reliability from the subscriber location to public switched telephone network (PSTN) interconnection points or other MFVN peer ...

4. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   The earliest systems were known as wiring plans and simply consisted of telephone sets, keys, lamps, and wiring. Key was a Bell System term of art for a customer-controlled switching system [1] such as the line buttons on the phones associated with such systems.

5. List of VoIP companies - Wikipedia

   en.wikipedia.org/wiki/List_of_VoIP_companies

   Web and Mobile applications, VoIP telephone service, broadband internet providers, and commercial telecommunication service Fastweb: Milan: Italy: Landline, broadband Internet, and digital television services Google: California: United States: instant messaging, video chat, SMS, and VoIP features through Google Hangouts and Google Voice ...

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

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

   In general, the types of phones and other devices supported by the MVNOs are in line with the technologies used by the Mobile Network Operator (MNO), the underlying cellular network provider. All major and regional MNOs use 4G LTE / LTE Advanced and 5G NR protocols (2G and 3G having been deprecated and shut down), with GSM technologies.

7. List of mobile network operators - Wikipedia

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

   List of countries by number of Internet users; List of countries by number of telephone lines in use; List of countries by smartphone penetration; List of multiple-system operators; List of telecommunications companies. List of telecommunications companies in the Americas; List of telecommunications companies in Asia and Oceania