SIMPLE (Session Initiation Protocol for IM and Presence Leveraging Extensions)
SIMPLE is an effort to bring interoperability to instant-messaging networks. It's based on SIP, a signaling and presence protocol used to establish Internet phone calls, multimedia conferences, chat sessions and interactive communications.
From the IETF's SIMPLE draft:
User presence is defined as the willingness and ability of a user to communicate with other users on the network. Historically, presence has been limited to "on-line" and "off-line" indicators; the notion of presence here is broader. Subscriptions and notifications of user presence are supported by defining an event package within the general SIP event notification framework.
Additional resources
IETF SIMPLE working group
Comments:
Instant Messaging
by Anu
Information about which the products in the market which use SIMPLE as of now could have been provided.
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