63 STAT.] MULTILATERAI-TELECOMMUNICATIONS-OCT. 2 . 1947 (Chapter XIII, art. 29 RR) (652458) Section IV. Forwarding (Routing) of Traffic 652 § 16. Traffic Frequency. 653 (1) Every station of the mobile service uses, in princi- ple, for the transmission of its traffic, one of its working fre- quencies as indicated in the list of stations, for the band in which the call has been made. 654 (2) In addition to its normal working frequency, printed in heavy type in the list of stations, every station may use one or more supplementary frequencies in the same band, in conformity with the provisions of article 33. 655 (3) The use of frequencies in the bands reserved for calling is forbidden for traffic with the exception of distress traffic (see article 33). 656 (4) If the transmission of a radiotelegram takes place on a frequency and/or class of emission other than that on which the call has been made the transmission of the radio- telegram is preceded by: - call sign of the station called, not more than three times; - the word DE; - call sign of the calling station, not more than three times. 657 (5) If the transmission is made on the same frequency and class of emission as the call. the transmission of the radio- telegram is preceded, if need be by: - the call sign of the station called; - the word DE; - call sign of the calling station. 658 § 17. Numbering in Daily Seris. As a general rule radiotelegrams of all kinds trans- mitted by ship stations and radiotelegrams in the service of public correspondence transmitted by aircraft stations are to be numbered in a daily series, number 1 being given to the first radiotelegram sent each day to each separate land station. 1837
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