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In telecommunication, an automatic callback is a service feature that permits a user, when encountering a busy condition, to instruct the system to retain the called and calling numbers and to establish the call when there is an available line.
Note 1: Automatic callback may be implemented in the terminal, in the switching system , or shared between them.
Note 2: Automatic callback is not the same as camp-on.
Source: from Federal Standard 1037C
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