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Success-to-the-top class of service routing

  • US 6,496,480 B1
  • Filed: 03/17/1999
  • Issued: 12/17/2002
  • Est. Priority Date: 03/17/1999
  • Status: Expired due to Fees
First Claim
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1. A method for routing telephone calls of different classes of service in a packet network between an originating switch and a terminating switch over a direct virtual path between the switches if available, and if not, then routing the call between the originating and terminating switches through one of a plurality of via switches, each coupled by separate first and second virtual paths to said originating and terminating switches, respectively, comprising the steps of:

  • (a) checking whether a direct virtual path exists between the originating and terminating switches and whether such direct link has an available bandwidth sufficient carry a call in accordance with its class of service; and

    if so (b) routing the call over the direct virtual path, otherwise, (c) checking whether the first virtual path associated with a first via switch that successfully carried a previous call between the originating and terminating switches has an available bandwidth sufficient to carry a new call in accordance with its class of service; and

    if so then routing said call from said originating switch to said first successful via switch, and (d) checking whether the second virtual path associated with said first successful via switch has an available bandwidth sufficient to carry a call in accordance with its class of service; and

    if so, routing the call from said first successful via to the terminating switch.

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