Nec Corporation

Daiso Co., Ltd.

Nobuo Yamada

Masato Tabuchi

Motoki Kitagawa

Toshikazu Takata

Kunio Iimura

An authentication system is applied for a voice network in order to provide the same security as that attained by a data network. Provided is a voice network access system wherein a one-time password system, which is used as an access authentication system, is applied for a voice network that is constituted by an private automatic branch exchange that includes an external interface; wherein the private automatic branch exchange is connected to a computer telephony server across the external interface for the exchange of sender number information that is received from a public network; and wherein the private automatic branch exchange is also connected via the external interface to an authentication system server, which receives a user's name from the computer telephony server and performs a personal authentication process using the user's name.

Voice network access system

An object of the present invention is to provide a method of obtaining high-purity sulfur-containing organosilicon compounds having polysulfide structure in a simple manner without treatment at high temperatures or under vacuum. According to the present invention, sulfur-containing organosilicon compounds represented by the formula (R.sup.1 --O).sub.3 --Si--R.sup.2 --S.sub.x --R.sup.2 --Si--(O--R.sup.1).sub.3 is obtained by reacting sulfur, an alkali metal and halogenoalkoxysilane represented by the formula (R.sup.1 --O).sub.3 --Si--R.sup.2 --X (wherein R.sup.1 is a monovalent C.sub.1-5 hydrocarbon, R.sup.2 is a divalent C.sub.1-9 hydrocarbon, X is a halogen, and x is an integral number of 1 to 8).

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Tokyo, Japan

Nobuo Yamada