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System and method for address resolution in internet protocol (IP) -based networks

  • US 20020027915A1
  • Filed: 05/11/2001
  • Published: 03/07/2002
  • Est. Priority Date: 09/01/2000
  • Status: Active Grant
First Claim
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1. In an Internet Protocol (IP)-based network utilizing Session Initiation Protocol (SIP) for call setup, a method of address resolution comprising the steps of:

  • receiving in a Resolver in the IP-based network, a call setup message from a requesting application, said call setup message including a destination address in a format other than an IP address;

    sending a DNS Query from the Resolver to a Domain Name Server (DNS), said DNS Query requesting an IP address associated with the destination address;

    sending an answer from the DNS to the Resolver, said answer including an IP address of a destination server and an indication of an Application protocol supported by the destination server;

    determining in the Resolver whether the Application protocol is SIP; and

    upon determining that the Application protocol is SIP, sending the IP address of the destination server from the Resolver to the requesting application.

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