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SIMPLE (instant messaging protocol)

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In computing, SIMPLE (SIP for Instant Messaging and Presence Leveraging Extensions) is an instant messaging (IM) protocol. In contrast to the vast majority of IM software deployed today, SIMPLE is an open standard.

SIMPLE applies the Session Initiation Protocol to the problems of:

  • Registering for presence events and receiving notifications when such events occur, for example when a user logs-in or comes back from lunch.
  • Managing a session of real-time messages between two or more participants.

SIMPLE is currently (May 2003) IETF work in progress, taking place in the simple workgroup. However, several implementations are already available, notably including the Microsoft Windows Messenger.

SIMPLE is not the only IM protocol being developed within the IETF. XMPP, based on the Jabber technology, is a contender.

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