Thanks Jason

    location                      [9] Location OPTIONAL,

    switchOffIndicator            [10] SwitchOffIndicator OPTIONAL,

    reRegRequiredIndicator        [11] ReRegRequiredIndicator OPTIONAL,

    unavailabilityPeriodDuration  [12] OCTET STRING (SIZE(1)) OPTIONAL

    unavailabilityPeriodDuration  [12] UnavailabilityPeriodDuration OPTIONAL

}

-- See clause 6.2.2.2.4 for details of this structure