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2. Session Initiation Protocol - Wikipedia

   en.wikipedia.org/wiki/Session_Initiation_Protocol

   The Session Initiation Protocol (SIP) is a signaling protocol used for initiating, maintaining, and terminating communication sessions that include voice, video and messaging applications. [1] SIP is used in Internet telephony, in private IP telephone systems, as well as mobile phone calling over LTE . [2]

3. VoIP phone - Wikipedia

   en.wikipedia.org/wiki/VoIP_phone

   Yealink Network Technology Co Ltd T27G VoIP Telephone Avaya IP phone. The overall hardware may look like a telephone or mobile phone. A VoIP phone has the following hardware components An handset with a headphone and a microphone, unless the whole telephone is a hand-held device containing these; A loudspeaker to act as a speakerphone

4. SIP trunking - Wikipedia

   en.wikipedia.org/wiki/SIP_trunking

   SIP trunking is a voice over Internet Protocol (VoIP) technology and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX) and unified communications facilities. [1]

5. The Benefits of VoIP Phone Systems - AOL

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

   VoIP phone systems for small businesses. There are plenty of service providers for companies ready to choose a business phone system. Vendors charge a monthly fee per user, and many offer a ...

6. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Full-service VoIP phone companies provide inbound and outbound service with direct inbound dialing. Many offer unlimited domestic calling and sometimes international calls for a flat monthly subscription fee. Phone calls between subscribers of the same provider are usually free when flat-fee service is not available. [12]

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.