6f3 STAT.] MULTILATERAI-TELECOMMUINICATIONS-OCT. 2 , 1947 (Chapter XII1, art. 29 RR) (631-441) 631 § 12. Frequency for Reply. 632 (1) For transmitting the reply to calls and to prepara- tory signals, the station called uses the frequency on which the calling station must keep watch, unless the calling sta- tion has specified a frequency for the reply. 633 (2) As an exception to this rule: 634 a) When a mobile station calls a coast station on the frequency 143 kc/s, the coast station shall transmit the reply to the call on its normal work- ing frequency in the bands between 110 and 160 kc/s, as indicated in the List of Coast and Ship Stations. 635 b) When a mobile station calls a coast station in one of the bands authorized for radiotelegraphy between 4 000 and 23 000 kc/s, the coast station shall transmit the reply to the call on its normal working frequency in the same band, this fre- quency being indicated in the List of Coast and Ship Stations. 636 § 18. Agreement on the Frequency to be Used for Traffic. 637 (1) If the station called is in agreement with the calling station, it transmits: 638 a) the reply to the call; 639 b) the service abbreviation indicating that from that moment onwards it will listen on the fre- quency announced by the calling station; c) if necessary, the indications referred to in 648; d) the letter K if the station called is ready to re- ceive the traffic of the calling station; e) if useful, the service abbreviation and figure indicating the strength and/or readability of the signals received (see appendix 9). (2) If the station called is not in agreement with the calling station on the frequency to be employed as the result of the arrangements under 623 and 624, it transmits: 1833 640 641 642 643
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