User equipment, network element, and method and communication system for establishing an emergency session

The invention relates to a a emergency session's method and system in communication system, comprising one or more relates to is an emergency session's network entity comprises at least user equipment. When the user equipment routing through directive identifier, for example calling number or a called entity the logic business message to a network entity causing the session, an claims a identifier for network entity receiving analysis. The detection discovered when conversation of the flowing is an emergency sessions, a return information to a user equipment, inform to the conversation of the back causing of the emergency sessions. The user equipment therefore the switch operating of emergency sessions. Therefore, the work and user equipment of for detecting the anticipated session is the emergency sessions, network is a inform user equipment and emergency session's information to ensuring consistency between datum wherein suitable for processing.