| Abstract
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Instant Messaging (IM) refers to the transfer of messages between
users in near real-time. These messages are usually, but not
required to be, short. IMs are often used in a conversational mode,
that is, the transfer of messages back and forth is fast enough for
participants to maintain an interactive conversation. Each message
can be sent independently using the SIP MESSAGE method, or messages
can be associated into sessions that are initiated using SIP. The
first approach is often referred to as pager-mode messaging, due to
its similarity to the behavior of two way pager devices. The second
approach is often called session-mode messaging, or simply message
sessions. This document describes a message session mechanism based
on the Common Presence and Instant Messaging message format.
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