Telecommunications – Radiotelephone system – Usage measurement
Reexamination Certificate
2007-07-20
2010-06-01
Nguyen, Tu X (Department: 2618)
Telecommunications
Radiotelephone system
Usage measurement
C455S518000
Reexamination Certificate
active
07729685
ABSTRACT:
Prepaid PTT service calls through a switched mobile communication network may originate at off-net roaming locations. A flag is set in a mobile telephone station indicating that the mobile station is that of a prepaid subscriber, to set a PTT client program to its “prepaid mode.” When the prepaid mobile station initiates a PTT call while roaming off-net, the call is directed to a prepaid server, and the PTT client program assists the subscriber to re-enter the called number when the prepaid server prompts the subscriber to do so. The call can then be extended from the prepaid server platform to a PTT switch for establishing communication with one or more selected contacts in a contact list, based on translation of the contact number to one or more destination telephone numbers for the called contact(s).
REFERENCES:
patent: 6496690 (2002-12-01), Cobo et al.
patent: 7545761 (2009-06-01), Kalbag
patent: 2003/0216147 (2003-11-01), Morin et al.
patent: 2004/0077332 (2004-04-01), Ephraim et al.
patent: 2004/0196826 (2004-10-01), Bao et al.
“Push to talk” retrieved from: http://en.wikipedia.org/wiki/Push—to—talk on Jul. 7, 2006, Wikipedia.
Chen Ben-Ren
Ephraim Robert Martin
Cello Partnership
McDermott Will & Emery LLP
Nguyen Tu X
LandOfFree
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