[ii] Patent Number: 4,873,720 [45] Date of Patent: Oct. 10, 1989
[54] AUTOMATIC DIALER
[75] Inventor: Masayoshi Son, Tokyo, Japan
[73] Assignee: Datanet Corp., Tokyo, Japan
[21] Appl. No.: 172,241
[22] Filed: Mar. 23, 1988
[51] Int. CI.4 H03M 1/27
[52] U.S. CI 379/356; 379/216;
379/221
[58] Field of Search 379/355, 354, 356, 357,
379/358, 359, 216, 221
[56] References Cited
U.S. PATENT DOCUMENTS
4,645,879 2/1987 Simmons 379/355
4,731,826 3/1988 Daie 379/355 X
Primary Examiner—James L. Dwyer
Attorney, Agent, or Firm—Finnegan, Henderson,
Farabow, Garrett & Dunner
[57] ABSTRACT
An automatic dialer, which generates a signal for selection of a communication line from a plurality of commu-' nication lines belonging to a plurality of common carriers before communication is made between a calling subscriber and a called subscriber. The automatic dialer automatically transmits a signal specifying one of a plurality of signal paths coupled to the called subscriber in addition to other necessary signals, thus minimizing the numbers dialed by a user and resulting in easier operation of the system. The ones of the plurality of signal paths specified by the system can be easily changed by a tone sent to the system.
2 Claims, 10 Drawing Sheets
