Method and apparatus for controlling call waiting service

Abstract

The utility of a call waiting service is enhanced. When telephone A is engaged in voice communication with telephone B, if there is a call from telephone C, the telephone number of the telephones B and C are temporarily stored in a CCB. If the telephone C goes on-hook before the telephone B does, the telephone number of the telephone C is transferred from the CCB to subscriber data and stored as a recall number. Thereafter, when a switchhook operation is performed on the telephone A during communication with the telephone B, an automatic call is made to the telephone C by using the stored telephone number. If the telephone B goes on-hook before the telephone C does, the telephone number of the telephone B is transferred from the CCB to the subscriber data and stored as a recall number. Thereafter, when a switchhook operation is performed on the telephone A during communication with the telephone C, an automatic call is made to the telephone B by using the stored telephone number.

Dependencies are inferred from the claim text.