Abstract: An automatic dialing method of a telephone system including an optical reception unit sensitive to infrared reception from an electronic pocketbook including an optical transmission unit for infrared transmission of a telephone number of an interested person registered in the electronic pocketbook. The dialing method includes receiving an infrared signal containing a telephone number of an interested person selected for an automatic dialing function, transmitted from the optical transmission unit of the electronic pocketbook, via the optical reception unit of the telephone system, when a telephone handset is in an off-hook state; analyzing data information representing the telephone number of the interested person contained in the infrared signal; and automatically dialing the telephone number of the interested person, via a dialer of the telephone system, corresponding to analyzed data information.

Abstract: A method and apparatus for controlling ring volume if a telephone by memorizing the ring volume in state where a telephone call is answered responsive to ring tone of the telephone and then, generating the ring tone with the memorized ring volume when a next telephone call occurs.

Abstract: A telephone is made up of a detachable key pad having a female connector, and a key pad receiving space formed to fit the key pad in the casing of the telephone with a male connector, wherein the female connector is connected with the male connector when the detachable key pad is inserted into the key pad receiving space.