54STAT.] MULTILATERAL-TELECOMMUNICATION-APR . 8 , 1938 1519 ARTICLE 19 Call to Several Stations Without Request for Reply [450] The call CP followed by two or more call signals or by a code tio S ve tst word (call to certain receiving stations without request for reply) forreply. shall be used only for the transmission of information of any nature intended to be read or utilized by anyone who is authorized. ARTICLE 20 Calling [451] §1. The provisions of this article shall not apply to aircraft c alig. when special procedures, determined in regional agreements between the countries concerned, are in force. These provisions shall never- theless always apply to aircraft entering into or wishing to enter into communication with a station of the radiomaritime service. [452] §2. (1) As a general rule, it shall devolve upon the mobile station to establish communication with the land station. It may call the land station for this purpose only after having arrived within the range of the latter. [453] (2) However, a land station having traffic for a mobile sta- tion may call that station if it has reason to assume that the said mobile station is within its range and is listening. [454] §3. (1) Furthermore, coast stations must, to the extent possi- ble, transmit their calls in the form of "lists of calls" consisting of the call signals of all mobile stations for which they have traffic on hand, at definite intervals, at least 2 hours apart, which have been estab- lished by agreements between the governments concerned. Coast stations which transmit their calls on the wave of 500 kc (600 m) shall transmit them in the form of "lists of calls", in alphabetical order, to include only the call signals of mobile stations for which they have traffic on hand and which are within their range. To their own call signal they shall add the abbreviations to indicate the working- wave they wish to use in the transmission. Coast stations which use continuous waves outside of the band of 365 to 515 kc (822 to 582 m) shall transmit the call signals in the order which is most convenient for them. [455] (2) The time at which coast stations transmit their lists of calls, as well as the frequencies and types of waves which they use for this purpose, must be indicated in the nomenclature. [456] (3) Mobile stations which, during this transmission, hear their call signal, must answer as soon as they can, following, so far as possible, the order in which they were called. [457] (4) When the traffic cannot be disposed of immediately, the coast station shall inform each mobile station concerned of the
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