RFC 6993 · INFORMATIONAL · 2013
SUN · 14 JUN 2026
Instant Messaging and Presence Purpose for the Call-Info Header Field in the Session Initiation Protocol
Overview
RFC 6993, “Instant Messaging and Presence Purpose for the Call-Info Header Field in the Session Initiation Protocol”, is an Informational document published in July 2013 by P. Saint-Andre. The canonical text is published by the RFC Editor.
Abstract
This document defines and registers a value of "impp" ("instant messaging and presence protocol") for the "purpose" header field parameter of the Call-Info header field in the Session Initiation Protocol (SIP).
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
Read this RFC
The canonical text of RFC 6993 is hosted at rfc-editor.org. Available in TXT,HTML.
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