Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2005-07-29
2009-08-11
Appiah, Charles N (Department: 2617)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S519000, C370S312000, C370S432000
Reexamination Certificate
active
07574227
ABSTRACT:
A method and system for dispatch calling using personal telephone numbers (PTNs) are provided. In accordance with the method and system, when a dispatch user enters a PTN as part of a dispatch call initiation, the originating dispatch call controller recognizes that the dispatch call request includes a PTN. If the originating dispatch call controller does not have the target subscriber in its recent call record cache, the originating call controller determines which home location registers (HLRs) serve subscribers with the particular NPA and NXX of the PTN. The originating call controller sends a request for the UFMI of the target subscriber to each of the determined HLRs. When the originating call controller receives a response from one of the HLRs with the UFMI, the originating call controller completes the dispatch call using the received UFMI.
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Ajibade Akonai Olumide T
Appiah Charles N
Nextel Communcations Inc.
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