http://tools.ietf.org/rfc/rfc3261.txt
A dialog is a peer-to-peer SIP relationship between two UAs that persists for some time. A dialog is established by SIP messages, such as a 2xx response to an INVITE request. A dialog is identified by a call identifier, local tag, and a remote tag. A dialog was formerly known as a call leg in RFC 2543.
The combination of the To tag, From tag, and Call-ID completely defines a peer-to-peer SIP relationship between caller and callee and is referred to as a dialog.
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