The Session Initiation Protocol (SIP) INFO Method
Abstract
This document proposes an extension to the Session Initiation
Protocol (SIP). This extension adds the INFO method to the SIP
protocol. The intent of the INFO method is to allow for the carrying
of session related control information that is generated during a
session. One example of such session control information is ISUP and
ISDN signaling messages used to control telephony call services.
This and other example uses of the INFO method may be standardized in
the future.
Phone System 