Call-back method in response to emergency call originating from cellular radiotelephone
First Claim
1. A method of operating a mobile telephone switching office (MTSO) to provide call-back to a cellular radiotelephone following an emergency call, said method comprising the steps of:
- (a) detecting an emergency call from a cellular radiotelephone;
(b) obtaining an identity code for said radiotelephone, said identity code being comprised of a radiotelephone MIN and a radiotelephone Electronic Serial Number (ESN);
(c) assigning said cellular radiotelephone a substitute mobile identification number (MIN);
(d) storing said identity code in association with said substitute MIN;
(e) enabling said call from said radiotelephone to a Public Safety Answering Position (PSAP);
(f) detecting a return call to said substitute MIN;
(g) extracting said radiotelephone MIN from said identity code;
(h) transmitting a paging message addressed to said radiotelephone MIN;
(i) receiving a plurality of paging confirmation messages in response to said transmitting step, each of said plurality of paging confirmation messages conveying said radiotelephone MIN; and
(j) determining whether one of said plurality of paging confirmation messages conveys said radiotelephone ESN.
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Accused Products
Abstract
An emergency call originates from a cellular radiotelephone (20) and communicates through one of A-side and B-side cellular systems. Upon receipt of the call, the cellular radiotelephone (20) is assigned a temporary substitute Mobile Identification Number (MIN) (100) by the receiving A-side or B-side cellular system MTSO (33). Upon termination of the emergency call, a call-back to the cellular radiotelephone (20) is routed to both of the A-side and B-side MTSOs (100), using the substitute MIN (100), by the Public Switched Telecommunications Network (36). Both A-side and B-side MTSOs (100) issue a page order message to cellular radiotelephone (20) by transmitting to the MIN (74). Paging order confirmation messages (78), conveying the MIN (74), are evaluated for a match with a unique Electronic Serial Number (76).
90 Citations
16 Claims
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1. A method of operating a mobile telephone switching office (MTSO) to provide call-back to a cellular radiotelephone following an emergency call, said method comprising the steps of:
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(a) detecting an emergency call from a cellular radiotelephone; (b) obtaining an identity code for said radiotelephone, said identity code being comprised of a radiotelephone MIN and a radiotelephone Electronic Serial Number (ESN); (c) assigning said cellular radiotelephone a substitute mobile identification number (MIN); (d) storing said identity code in association with said substitute MIN; (e) enabling said call from said radiotelephone to a Public Safety Answering Position (PSAP); (f) detecting a return call to said substitute MIN; (g) extracting said radiotelephone MIN from said identity code; (h) transmitting a paging message addressed to said radiotelephone MIN; (i) receiving a plurality of paging confirmation messages in response to said transmitting step, each of said plurality of paging confirmation messages conveying said radiotelephone MIN; and (j) determining whether one of said plurality of paging confirmation messages conveys said radiotelephone ESN. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a mobile telephone switching office (MTSO) for a first one of an A-side cellular system and a B-side cellular system to provide call-back to a cellular radiotelephone following an emergency call, said method comprising the steps of:
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(a) detecting an emergency call initiated by said cellular radiotelephone; (b) obtaining an identity code for said cellular radiotelephone; (c) assigning said cellular radiotelephone a substitute mobile identification number (MIN) from a list of substitute MINs accessible by said A-side and B-side cellular systems; (d) storing said identity code in association with said substitute MIN from said MTSO; (e) enabling said call from said radiotelephone to a Public Safety Answering Position (PSAP); (f) detecting a return call directed to said substitute MIN; and (g) paging, in response to said step (f), said radiotelephone assigned said substitute MIN. - View Dependent Claims (9, 10, 11, 12)
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13. A method of operating cellular radio telecommunication network having an A-side cellular system mobile telephone switching office (MTSO) and a B-side cellular system MTSO to provide call-back on each of said A-side and B-side cellular systems to a cellular radiotelephone following an emergency call, said method comprising the steps of:
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(a) detecting an emergency call at a first one of said A-side and a B-side MTSOs from said cellular radiotelephone; (b) obtaining, at said first MTSO, an identity code for said cellular radiotelephone; (c) assigning a substitute mobile identification number (MIN) from a list of substitute MINs, said list being accessible to said A-side and B-side MTSOs; (d) communicating said identity code and said substitute MIN to a second one of said A-side and B-side MTSOs; (e) storing said identity code in association with said substitute MIN at each of said A-side and B-side MTSOs; (f) enabling said call from said radiotelephone to a Public Safety Answering Position (PSAP) through said first MTSO; (g) detecting a return call directed to said substitute MIN at each of said A-side and B-side MTSOs; and (h) paging from each of said A-side and B-side MTSOs, in response to said step (g), said radiotelephone assigned said substitute MIN by transmitting a page order directed to said identity code. - View Dependent Claims (14, 15, 16)
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Specification