Gatekeeper transport address determination in an internet telephony system using a domain alias
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United States of America Patent
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Apr 16, 2002
Grant Date -
N/A
app pub date -
Nov 13, 1998
filing date -
Nov 13, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An Internet Protocol (IP) telephony system cross-references transport addresses of Gatekeepers using a domain name of the IP telephony system. The IP telephony system is serviced by at least one Gatekeeper and the transport address for each Gatekeeper is stored on a Domain Name Server (DNS). An A record or other suitable record may be employed within the DNS to index the transport addresses of the Gatekeepers to the IP telephony system domain name. A calling endpoint first queries the DNS for the transport address of a Gatekeeper servicing the IP telephony system. The DNS address retrieves at least one transport address for the Gatekeeper(s) and returns the transport address(es) to the calling endpoint. When querying the DNS, the calling endpoint may use an identifier such as subscribername@Gatekeeper.ABC.domain where the user name of the called endpoint is 'subscribername' and the domain name of the IP telephony system is ABC.domain.
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