5.8A Procedures at the MRB

24.2293GPPIP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Release 18Stage 3TS

For all SIP transactions identified:

– if priority is supported, as containing an authorised Resource-Priority header field, or, if such an option is supported, relating to a dialog which previously contained an authorised Resource-Priority header field;

the MRB shall give priority over other transactions or dialogs. This allows special treatment of such transactions or dialogs. If priority is supported, the MRB shall adjust the priority treatment of transactions or dialogs according to the most recently received authorized Resource-Priority header field or backwards indication value.

NOTE: This special treatment can include filtering, higher priority processing, routeing, call gapping. The exact meaning of priority is not defined further in this document, but is left to national regulation and network configuration.

The MRB shall log all SIP requests and responses that contain a "logme" header field parameter in the SIP Session-ID header field based on local policy.