A system selects a tone at which a pilot sequence is to be transmitted. The system includes logic configured to adaptively select a tone on which the pilot sequence is transmitted based one or more conditions in the transmission system.

 
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> COMMUNICATION APPARATUS, INFORMATION DISPLAY METHOD, INCOMING CALL DISPLAY METHOD, INCOMING CALL HISTORY DISPLAY METHOD, PROGRAMS FOR IMPLEMENTING THE METHODS, AND STORAGE MEDIUM IN WHICH THE PROGRAM IS STORED

> Telephone intercom methods and systems
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