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Dual channel ISDN terminal call identification and switching system

  • US 5,610,976 A
  • Filed: 04/25/1995
  • Issued: 03/11/1997
  • Est. Priority Date: 04/28/1994
  • Status: Expired due to Term
First Claim
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1. A switching system accommodating a plurality of public lines of an Integrated Services Digital Network (ISDN) at a public line side and a plurality of terminals of the ISDN at a private line side, comprising:

  • identifying means for identifying a calling terminal issuing a first channel call and issuing a second channel call, both issued at the public line side of the ISDN; and

    connecting means for automatically connecting the identified calling terminal at the public line side of the ISDN to a private-side ISDN terminal without the calling terminal calling a private line number of a private ISDN terminal and upon, after issuance of the second channel call, the identifying means identifying the calling terminal as being the same calling terminal from which the first channel call was made, based upon common information obtained at the issuance of each of the first channel call and the second channel call.

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