Patent ID: 7272415

Claim:
A telephone system including a main device and a telephone set connected to said main device, said telephone system comprising a portable terminal including a display unit, said portable terminal comprising interface means for interfacing said display unit with said main device to present, as an operation screen, an image of said telephone set on a web page displayed on said display unit and to enable to use a function of said telephone set on said portable terminal by an operation on the operation screen displayed on said display unit, wherein said portable terminal includes a first voice authentication means and said main device includes a second voice authentication means, in which a user of said portable terminal is authenticated to access said telephone set by said telephone system first attempting to authenticate speech output by said user and received by said portable terminal using voice data stored in a first memory of said portable terminal for said first voice authentication means to determine whether or not there is a match, and if there is not a match, the user of said portable terminal is next attempted to be authenticated by said telephone system by using voice data stored in a second memory of said main device and said speech output by said user, as forwarded to said main device by said portable terminal, for said second voice authentication means to determine whether or not there is a match, and if both of said first and second voice authentication means do not determine that there is a match, the user is not allowed to use said portable terminal to access said telephone set.