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Serial telephone adapter

  • US 6,175,565 B1
  • Filed: 09/17/1997
  • Issued: 01/16/2001
  • Est. Priority Date: 09/17/1997
  • Status: Expired due to Term
First Claim
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1. A system for use with a telephony terminal and a personal computer to provide telephone access to a computer-based communications network via said personal computer, said system comprising:

  • application software in said personal computer to execute an operating system program;

    a serial telephone adapter connected between said telephony terminal and a serial communications port on said personal computer, said adapter having a receiver/transmitter to receive and transmit respectively telephony communications from and to said terminal, and a converter to convert said telephony communications from analog to digital and digital to analog;

    a system transfer protocol to coordinate transfer of telephony communications and control messages between said personal computer and said serial telephone adapter said protocol requiring that control messages from the personal computer to the serial telephone adapter be acknowledged by the serial telephone adapter before another control message is sent; and

    an interface in said adapter to connect said telephony terminal to the public switched telephone network (PSTN) if said computer-based communications network is not available for service.

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