This TS specifies the stage three, Protocol Description of the network feature Operator Determined
Barring (ODB) of IMS Multimedia Telephony Services.
It provides the protocol details in the IP Multimedia (IM) Core Network (CN) subsystem based
on the Session Initiation Protocol (SIP) and the Session Description Protocol (SDP). In addition, it provides protocol details for XCAP for barring of supplementary services configuration.