Creating the Refresh Message

The refresh message takes the form of a re-INVITE when the force-reinvite parameter in the session timer profile is enabled. If this parameter is disabled and the remote end supports UPDATE requests, an UPDATE message will be sent.

UPDATE messages contain no SDP information.

Re-INVITE messages contain the SDP that is the same as what was sent before.

The refresh request’s Session-Expires: header value is set to the existing value for the session. The refresher parameter is set to uac since the Oracle® Enterprise Session Border Controller acts like a UAC for this refresh transaction. The Min-SE header is also included.