Method and apparatus for token distribution in session for future polling or subscription

摘要: A system and a method are disclosed for authenticating subsequent callback from public safety answering point (PSAP) in response to user agent's initial emergency call. In one embodiment, the agent forwards token PSAP during call, returns callback. The is authenticated when forwarded returned tokens match. another encrypts using Public Key Infrastructure encrypted PSAP. decrypts and, upon callback, includes signed digital certificate based on token. authenticates decrypted matches originally sent yet first Upon second performs function pair of received forward result agent. same obtain local result. results