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2. 10 Phone Systems for Small Businesses - AOL

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

   Grasshopper: A flat-fee phone system option. Grasshopper is a virtual phone system that charges a flat rate instead of per-user fees. It forwards calls to an existing business phone number or cell ...

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. Line2 - Wikipedia

   en.wikipedia.org/wiki/Line2

   Line2 is a Virtual PBX phone service that allows companies to develop and maintain multiple internal phone lines to handle multiple external calls. Line2 uses cloud computing to allow one phone call to go to shared receivers, such as cell phones or fax machines, depending on which is more appropriate. Line2 allows for such transfers without any ...

5. Virtual number - Wikipedia

   en.wikipedia.org/wiki/Virtual_number

   A virtual number is a telephone number that is not directly associated with a telephone line. It is used to forward incoming calls to one or more pre-set telephone numbers chosen by the client. Virtual numbers are often used for privacy reasons, as they allow users to keep their personal phone numbers private while still receiving calls.

6. Comparison of VoIP software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_VoIP_software

   Most softphone clients utilize the Session Initiation Protocol (SIP), an open standard that supports various audio and video codecs. Some systems, like Skype, operate on proprietary protocols but can integrate with SIP-based systems through specialized business telephone system (PBX) software.

7. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   A business telephone system differs from an installation of several telephones with multiple central office (CO) lines in that the CO lines used are directly controllable in key telephone systems from multiple telephone stations, and that such a system often provides additional features for call handling.