When the resource reservation is completed, UE1 sends the UPDATE request to the terminating endpoint, via the signalling path established by the INVITE request.
: Takes the value of the Contact header of the received 183 Session Progress response.
: Takes the value of either the IP address or FQDN of the originating UE.
: Takes a higher value than that in the previous request.
: Contains the security agreement as represented by the received Security-Server header.
: Indicates that the resource reservation was successful in the local segment.