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Method and apparatus to carry out resolution of entity identifier in circuit-switched networks by using a domain name system

  • US 6,839,421 B2
  • Filed: 10/29/2001
  • Issued: 01/04/2005
  • Est. Priority Date: 10/29/2001
  • Status: Expired due to Term
First Claim
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1. A method for a circuit-switched communications network to provide communication services to a subscriber, comprising:

  • receiving from a first entity a request over the circuit-switched communications network for a first service involving a second entity associated with a second entity identifier;

    a circuit-switched routing node in the circuit-switched communications network sending a routing request to a number portability database in the circuit-switched communications network with the second entity identifier;

    the number portability database sending a message to a domain name system (DNS) server in a packet-switched network requesting a second service related to the second entity identifier;

    receiving a result of the second service from the DNS server; and

    providing the first service using the result.

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