scope:

This document specifies the identity management and authentication protocols needed to support Mission Critical Push To Talk (MCPTT). Identity management applies only to on-network operation.

Mission critical communication services are services that require preferential handling compared to normal telecommunication services, e.g. in support of police or fire brigade.

The MCPTT service can be used for public safety applications and also for general commercial applications (e.g., utility companies and railways).

This document is applicable to User Equipment (UE) supporting the identity management client functionality, and to application servers supporting the identity management server functionality