Telephone command apparatus
Methods and apparatus for special status indication in telephone systems
Telephone information displaying device
Arrangement for requesting service for called telephone subscribers
Method and apparatus for processing coded information received through a telephone line during the inter-ringing periods Patent #: 4383138
ApplicationNo. 06/512955 filed on 07/12/1983
US Classes:379/142.01, RECEPTION OF CALLING INFORMATION AT SUBSTATION IN WIRELINE COMMUNICATIONS SYSTEM379/372, Signal reception at substation379/93.14, Having switching station379/93.23, Having user information display (e.g., telephone number, name, address, etc.)379/93.28Modulated audio tone
ExaminersPrimary: Rubinson, Gene Z.
Assistant: Brady, W. J.
Attorney, Agent or Firm
International ClassesH04M 1/57 (20060101)
H04M 1/57 (20060101)
AbstractFor use with a telephone switching system serving a plurality of stations and having a central processor for generating data messages and a ringing circuit for generating ringing signals to a selected station, method and apparatus are disclosed for sending a data message to a selected station during a silent interval between ringing signals. The apparatus includes a detector and a sender. Responsive to a first ringing signal, the detector generates a status signal representative of the silent interval between ringing signals. During the silent interval, the sender sends to the selected station a frequency shift keyed signal representative of the data message.