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SIMPLE, the Session Initiation Protocol for Instant Messaging and Presence Leveraging Extensions, is an instant messaging (IM) and presence protocol suite based on Session Initiation Protocol (SIP) managed by the Internet Engineering Task Force.[1]


SIMPLE applies SIP to the problems of:

Implementations of the SIMPLE based protocols can be found in SIP Softphones and also in SIP Hardphones.

Technical description


The SIMPLE presence specifications can be broken up into:


SIP defines two modes of instant messaging:

See also


  • Rosenberg, J. (April 2013). SIMPLE Made Simple: An Overview of the IETF Specifications for Instant Messaging and Presence Using the Session Initiation Protocol (SIP). IETF. doi:10.17487/RFC6914. RFC 6914. Retrieved September 24, 2013.