| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To switch-over from a hand set telephone conversation to a hands-free telephone conversation with exact timing. <P>SOLUTION: When a portable telephone 1 and other portable telephones 21 performs by a hand set telephone conversation a telephone conversation through telephone network 22, and short-range radio transmission based on a telecommunication standard of bluetooth between the portable telephone 1 and a hands-free instrument 9 is possible, the telephone conversation is switched over into hands-free telephone conversation by using the hands-free instrument 9 by manipulating, for example, a predetermined key of the portable telephone 1. If a person who uses the portable telephone 1 is located outside of a vehicle, switching over from hand set telephone conversation to hands-free telephone conversation can be avoided in advance, by not operating the predetermined key; whereas if person who uses the portable telephone 1 is located inside of the vehicle, the hand set telephone conversation can be switched over to the handsfree telephone conversation by operating the predetermined key. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
