Patent ID: 6917612
Filing Date: 2005-07-12
Classification: H04L,H04M

Abstract:
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.