Technique for enabling emergency call callback of a terminal without a valid subscriber identity
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United States of America Patent
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-
May 27, 2003
Grant Date -
Aug 15, 2002
app pub date -
Feb 15, 2001
filing date -
Feb 15, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A technique for enabling a callback by a called party, such as an emergency center, of a terminal, such as a mobile terminal having no identity and no CBN (Call Back Number), in the case of an emergency call, for example, includes allocating a temporary identity to the terminal and then allocating an IP address to the terminal and storing the association between the temporary identity and the allocated IP address. A CBN is that allocated to the mobile terminal and the association between the CBN and the allocated IP address is also stored. A call is then setup between the terminal and the called party. Upon the call between the terminal and the called party being dropped, the IP address associated with the allocated CBN of the terminal is retrieved as is the stored temporary identity corresponding to the retrieved IP address. Paging is then forwarded to the terminal using the stored temporary identity and a call is again setup between the terminal and the called party.
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