54STAT.] MULTILATERAL-TELECOMMUNICATION-APR. 8 , 1938 [407] When an agreement is reached on the wave which the calling station must use for its traffic, the station called shall transmit the letter K after the indications contained in its reply. [409] (4) Reply to the request for transmissionby series The station called, replying to a calling station which has asked to transmit its radiotelegrams in series [§4 (4)] [Nos. 389 and 390], shall indicate, by means of the regulatory abbreviation, whether it refuses or accepts and, in the latter case, if need be, shall specify the number of radiotelegrams which it is ready to receive in one series. [410] (5) Difficulties in reception [411] (a) If the station called is prevented from receiving, it shall reply to the call as indicated in paragraph (3) [No. 396], but it shall replace the letter K by the signal . - . .. (wait), followed by a number indicating in minutes the probable duration of the wait. If this probable duration exceeds 10 minutes (5 minutes in the aeronautical mobile service), a reason must be given therefor. [412] (b) When a station receives a call without being certain that this call is intended for it, it must not reply before the call has been repeated and understood. When, on the other hand, a station receives a call which is intended for it, but is doubtful about the call signal of the calling station, it must reply immediately, using the regulatory abbreviation instead of the call signal of the latter station. [413] [414] §6. ROUTING OF TRAFFIC (1) Traffic wave [415] (a) Each station of the mobile service shall transmit its traffic by using, in principle, one of its working-waves, as they are indicated in the nomenclature for the band in which the call was made. [416] (b) Outside of its normal working-wave, which is printed in boldface type in the nomenclature, each station may use additional waves of the same band, in accordance with the provisions of article 21, §4 (2) [No. 484]. [417] (c) The use of calling-waves for traffic shall be governed by article 21. [418] (d) If the transmission of a radiotelegram takes place on another frequency and/or type of wave than that on which the call was made, the transmission of the radiotelegram shall be preceded by: not more than three times, the call signal of the station called; the word DE; not more than three times, the call signal of the calling station. [419] If the transmission is made on the same frequency and type of wave as the call, the transmission of the radiotelegram shall be preceded, in case of need, by the call signal of the station called; by the word DE; by the call signal of the calling station. Routing of traffic. odt, p. 125 . 1513
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