System and method for routing voice over IP calls
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United States of America Patent
Stats
-
Nov 2, 2004
Grant Date -
May 8, 2003
app pub date -
Nov 2, 2001
filing date -
Nov 2, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An SIP server in an IP-based infrastructure supporting wireless telephones determines whether, based on the destination address in a call request, the call is an intrasystem call or an intersystem call. For intrasystem calls the SIP server routes VOIP packets directly between the originating and destination devices. For intersystem calls, however, and in particular encrypted calls, instead of routing the VOIP packets through the public Internet, the SIP server instantiates a circuit-switched call using a local modem bank connected to the PSTN. In this way, quality of service assurance is obtained and latency reduced.
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Family
International Classification(s)
- Non-US Classification not provided for expired patents
Cited Art Landscape
Patent Citation Ranking
- Citation Ranking not provided for expired patents
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