Patent ID: 8498223

Claim:
In a packet data telecommunication network serving one or more end terminals and/or Mobile Stations (MSs), a method for establishing, managing, modifying, and terminating an End-to-End (E2E) Emergency Service (ES) Chain-of-Trust (CoT) from an Access Serving Network (ASN) and Connectivity Service Network (CSN) to a PSAP, PSAP proxy, or PSAP gateway, the method comprising: creating a trust relationship amongst components in the established ES CoT; allowing or validating the granting of any unauthenticated or unprovisioned ES network access and ES operation establishment, modification, and termination requests from amongst the components in an ES CoT based on the created trust relationship; and assisting a particular terminal/MS or ES network component attempting to establish an ES session between an ES user agent of the terminal/MS and a serving PSAP.