Communication terminal device and method of controlling same
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United States of America Patent
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Nov 27, 2007
Grant Date -
Mar 18, 2004
app pub date -
Feb 27, 2003
filing date -
Sep 17, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A communication terminal device which comprises an SIP call control unit that performs call control by using an SIP (Session Initiation Protocol), a recognition unit that recognizes that a calling has become an error according to a response signal sent back from a called party terminal after making the call according to the SIP call control procedure, a redial management unit that manages a redial interval to make a redial when the calling has become an error, and a redial control unit that performs redial control according to redial information when the calling has become an error and the response signal contains the redial information.
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