The CCITT, considering Recommendation U.1 [1] relative to signalling conditions to be applied in the international telex service and Recommendation F.60 [2] relative to operational provisions for the international telex service, unanimously declares the view that terminal apparatus participating in the international telex service should normally always be available to receive a call in accordance with the conditions set forth in Recommendations U.1 and F.60; that start-stop apparatus used in the telex service should be so equipped, or provided with the necessary devices, to permit of operation in accordance with Recommendations U.1 [1] and F.60 [2]; that, if a subscriber’s apparatus is such that he can use his teleprinter outside communication periods in order to prepare perforated tapes, for local checking of those tapes, for staff training, etc., the possibility of taking the answer-back may be delayed for a period not exceeding 3 seconds after connection of the called subscriber.