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2. Line2 - Wikipedia

   en.wikipedia.org/wiki/Line2

   It provides similar service to applications like Skype, which also allow users to place calls over the Internet for a smaller fee than using a regular phone line. Calls can be made over Wi-Fi, a 3G or 4G phone network, or cellular voice connections. [4] Line2 also gives users two lines; one for business, the other for personal calls.

3. The Benefits of VoIP Phone Systems - AOL

   www.aol.com/benefits-voip-phone-systems...

   Over 30% of U.S. companies use Voice over Internet Protocol (VoIP) phone systems. Many switch from conventional services to realize the benefits of VoIP, including lower costs, operational ...

4. Comparison of VoIP software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_VoIP_software

   These systems eliminate geographic restrictions on phone numbers, enabling users to maintain local numbers in any area code regardless of their physical location. For example, a user can operate a New York phone number while residing in Tokyo, facilitating global mobility and reducing international communication costs.

5. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   ShoreTel IP phone systems with unified communications and contact center built in; Snom One free/blue/yellow (Snom acquired and renamed pbxnsip) (SIP) Speedflow Communications VoIP class 4/5 softswitches with integrated billing, transcoding, SIP-H.323 converter.

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. Unified communications - Wikipedia

   en.wikipedia.org/wiki/Unified_communications

   The system —PBX or key telephone system— accepted the call and routed the call to the appropriate extension or line appearance on the phones at the customer's office. In the 1980s, voice mail systems with IVR-like features were recognized as an access mechanism to corporate information for mobile employees, before the explosion of cell ...