A.8 Private call confidentiality

33.1793GPPRelease 13Security of Mission Critical Push To Talk (MCPTT) over LTETS

[33.179 MCPTT-A.8-001] It shall be possible to establish a unique Private Call security context between any pair of authorized MCPTT users within the MCPTT system. The security context shall not be available to other MCPTT users, except, where necessary, authorized MCPTT monitoring functions (e.g. LI, Discreet Listening). If the security context is made available to monitoring functions, appropriate controls and logging shall exist. This requirement applies when MCPTT UEs are operating both on-network and off-network.

[33.179 MCPTT-A.8-002] The Private Call security context shall provide a means to provide confidentiality and integrity protection of user traffic, and authenticate the MCPTT users involved in the Private Call.