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Signaling system and method for enabling PBX-PBX feature transparency across a switched public network

  • US 5,818,921 A
  • Filed: 03/14/1996
  • Issued: 10/06/1998
  • Est. Priority Date: 03/14/1996
  • Status: Expired due to Term
First Claim
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1. A system for transporting private branch exchange features transparently across a switched public network, comprising:

  • an originating private branch exchange including,a call processing section for generating call/feature control data, the call/feature control data including one or more proprietary ISDN protocol elements and one or more standard ISDN protocol elements, anda first interface for coupling said originating private branch exchange to the switched public network, said first interface receiving the call/feature control data from said call processing section, packing the proprietary ISDN protocol elements into a transparent data transport scheme, and transmitting the proprietary ISDN protocol elements packed in the transparent data transport scheme and the standard ISDN signaling protocol elements over the switched public network; and

    a destination private branch exchange including a second interface for coupling said destination private branch exchange to the switched public network, said second interface receiving the proprietary ISDN protocol elements in the transparent data transport scheme and the standard ISDN protocol elements, and unpacking the proprietary ISDN protocol elements from the transparent data transport scheme, whereby said transparent data transport scheme utilizes a user-user signaling data service packet.

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