2002-368888 is referenced by 2 patents.

PROBLEM TO BE SOLVED: To provide an intercom having excellent convenience that can identify a visitor with high accuracy even when the visitor is a visitor for the list time and attain communication with the dweller of a visited place. SOLUTION: A reception section 5 acquires a phone number of a mobile phone possessed by a visitor, and a transfer function section 204 references the acquired telephone number with a telephone number of a visit scheduled person, identifies the visitor and transfers the visitor's call to a portable information terminal 3 possessed by the dweller of a visited place when the transfer of the call is required.

Title
Intercom system
Application Number
2001-174975
Publication Number
2002-368888
Application Date
June 11, 2001
Publication Date
December 20, 2002
Inventor
Hirano Yasuhiro
Hatae Hiroshi
Sakamoto Koji
Suzuki Takashi
Kawahara Takayuki
Otsubo Hiroyasu
Ota Masutomi
Assignee
Hitachi
IPC
H04M 03/54
H04M 09/00