1.3. SIP Overview

Session Initiation Protocol (SIP) is an ASCII-based, peer-to-peer protocol designed to provide telephony services over the Internet. The SIP standard was developed by the Internet Engineering Task Force (IETF) and is one of the most commonly used protocols for VoIP implementations.

Some of the advantages of using SIP include:

• The SIP protocol stack is smaller and simpler than other commonly used VoIP protocols, such as H.323.
• SIP-based systems are more easily scalable because of the peer-to-peer architecture used. The hardware and software requirements for adding new users to SIP-based systems is greatly reduced.
• Functionality is distributed over different components. Control is decentralized. Changes made to a component have less of an impact on the rest of the system.
• SIP is Internet-enabled.

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