Call-back method in response to emergency call originating from

Telecommunications – Radiotelephone system – Emergency or alarm communication

Patent

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Details

455433, H04Q 700, H03M 1100

Patent

active

059373440

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).

REFERENCES:
patent: 4926496 (1990-05-01), Cole et al.
patent: 5365570 (1994-11-01), Boubelik
patent: 5465388 (1995-11-01), Zicker
patent: 5497412 (1996-03-01), Lannen et al.
patent: 5563931 (1996-10-01), Bishop et al.
patent: 5689548 (1997-11-01), Maupin et al.
patent: 5712900 (1998-01-01), Maupin et al.

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