A Mechanism for Transporting User-to-User Call Control Information in SIP

This RFC 7433 was published in 2015.

Abstract

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.

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