Patent ID: 7561564

Claim:
An IP telephone that makes it possible for a user to know before making a connection with a party to be called whether the party to be called is an IP telephone or not, the IP telephone comprising: a display to display a plurality of opposite parties' telephone numbers; a cursor and a key to move the cursor on the display thereby to select an opposite party's telephone number to be called; a memory operatively coupled to the display; a registerer that stores telephone management information into the memory, the telephone management information including at least a telephone number of an opposite party; and an adder that automatically adds a marker to telephone management information on an opposite party when the IP telephone determines that the opposite party's telephone is an IP telephone; whereby the display displays to the user a plurality of the telephone numbers and indicates to the user, via the marker, whether the opposite party's telephone number is an IP telephone or not according to the telephone management information in the memory before making a connection with the opposite party.