The provisions of this
Recommendation are limited to enquiries concerning messages handled by an
interworking function (IWF) in accordance with the relevant F.80-Series
Recommendations. Status enquiry in respect of messages deposited into a telex
store and forward unit (SFU) for delivery to the international telex service
are handled in accordance with Recommendation F.72. The provisions of this
Recommendation should be applied to future implementations and, as far as
possible, to existing implementations of IWF and SFU, in the latter case as an alternative
to the provisions of Recommendation F.72 in respect of status enquiry.