The request was received by a UAS that contained an encrypted MIME body
for which the recipient does not possess or will not provide an
appropriate decryption key.
The server is refusing to service the request because the message body
of the request is in a format not supported by the server for the
requested method.
UPDATE -
Static variable in interface javax.sip.message.Request
UPDATE is an extension method that allows a client to update parameters
of a session (such as the set of media streams and their codecs) but has
no impact on the state of a dialog.