This is an optional integer that specifies for how long time a
failed SIP2 server is marked as failed. If no reply is received from the
requested SIP2 server after all retries are used, the server is marked as
failed. It is not connected again until
FailureBackoffTime has been expired. The unit is
seconds and the default value is 0, which means that the
server is never marked as failed and always expected to be
working.