The invention relates to Internet telephony, and in particular an arrangement of gatekeepers in a H. A coupling agent is added to obtain a polymer including branched and linear components. A flange extends from each distal end portion of the respective first and second panels. A pulsation frequency is determined based on the judgment as to the body motion. When a match is found, the server retrieves information associated with the matched reference digital signature and returns, to the device, the retrieved information.