63 STAT.] MULTILATEAT - T E L ECOMIAMUNICATIONS-OCT. 2, 1947 (Chapter XIII, art. 29 RR) (644651) 644 a) the reply to the call; 645 b) the service abbreviation indicating the frequency and, if useful, the class of emission proposed; 646 c) if necessary, the indications specified in 648. 647 (3) When agreement is reached regarding the fre- quency which the calling station shall use for its traffic, the station called transmits the letter K after the indications con- tained in its reply. 648 § 14. Reply to the Request for Transmission by Series. The station called, in replying to a calling sta- tion which has proposed to transmit its radiotelegrams by series (629), indicates, by means of the service abbreviation, its acceptance or refusal. In the former case it specifies, if necessary, the number of radiotelegrams which it is ready to receive in one series. 649 § 15. Difficulties in Reception. 650 (1) If the station called is prevented from receiving, it replies to the call as indicated in 636, but it replaces the letter K by the signal . -.. (wait), followed by a number indi- cating in minutes the probable duration of the waiting time. If the probable duration exceeds 10 minutes (5 minutes in the case of aircraft stations communicating with stations of the maritime mobile service), the reason for the delay must be given. 651 (2) When a station receives a call without being certain that such a call is intended for it, it must not reply until the call has been repeated and understood. When, on the other hand, a station receives a call which is intended for it, but is uncertain of the call sign of the calling station, it must reply immediately, using the service abbreviation in place of the call sign of this latter station. 819339 0-52-PT. 11---35 1835
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