Gizmo5 - Make free internet calls from your mobile phone and computer

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	What is SIP?

Solution
SIP is an acronym. It stands for Session Initiation Protocol, and it is defined in rfc 3261.

Basically, SIP is a standards based protocol that can be used to connect phone calls over the internet. Complying with this standard allows Gizmo5 to interact with lots of other VoIP networks and devices.

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