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What is SIP, and how does it work ?

April 26, 2017SIP

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What is SIP, and how does it work ?

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The Session Initiation Protocol (SIP) is an industry-standard application-layer control protocol that can establish, modify and terminate multimedia sessions or calls. Examples of multimedia sessions include multimedia conferences, distance learning, and Internet telephony. SIP is fully specified in RFC 2543. With SIP, you join a SIP Registrar (such as the free IPTel.org or Free World Dialup) and configure your phone with the Registrars name and your username. Your SIP phone then keeps the SIP Registrar informed of your presence (whether you are online, and which IP address you can be contacted at). When someone tries to ring you they ‘dial’ a SIP URL (which looks like an email address, e.g. SIP:netbro@iptel.org). Their phone contacts your registrar and gets your last known IP address, then tries to contact your phone.