What Is SIP Trunking?


Quick Answer

SIP, or Session Initiation Protocol, trunking uses Voiceover Internet Protocol, also known as VoIP, to connect a private branch exchange, or PBX, to the Internet. This technology uses the Internet to replace traditional telephone trunk lines, making communications easier for both land-line owners and mobile users.

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Full Answer

Use of SIP trunking separates unified communications – integrated technologies used for telephone calls, email, text messaging and multimedia – into separate private and public domains. Private SIP trunking for home users provides VoIP support for phone and other multimedia and messaging technologies while public-domain trunking provides full VoIP solutions to Public Switched Telephone Networks and Public Land Mobile Networks. SIP trunking also connects these two domains.

SIP trunking’s biggest advantage is its capability to combine voice, data and video on a single line, making it possible to talk on the phone, watch paid television and work on the Internet with a single data line into the home or office. Trunking streams video and music to mobile phones and tablets. Because SIP trunking replaces traditional phone lines and can handle all kinds of data over a single broadband line, it’s much more cost-effective for subscribers and providers alike. Although overall use of bandwidth increases, the cost of supporting infrastructure is much cheaper.

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