A new Request for Comments is now available in online RFC libraries.
RFC 7433
Title: A Mechanism for Transporting User-to-User
Call Control Information in SIP
Author: A. Johnston, J. Rafferty
Status: Standards Track
Stream: IETF
Date: January 2015
Mailbox: [email protected],
[email protected]
Pages: 19
Characters: 45687
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-cuss-sip-uui-17.txt
URL: https://www.rfc-editor.org/info/rfc7433
There is a class of applications that benefit from using SIP to
exchange User-to-User Information (UUI) data during session
establishment. This information, known as call control UUI data, is
a small piece of data inserted by an application initiating the
session and utilized by an application accepting the session. The
syntax and semantics for the UUI data used by a specific application
are defined by a UUI package. This UUI data is opaque to SIP and its
function is unrelated to any basic SIP function. This document
defines a new SIP header field, User-to-User, to transport UUI data,
along with an extension mechanism.
This document is a product of the Call Control UUI Service for SIP Working
Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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