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The present document contains a study of the security aspects of the Mission-Critical Push-To-Talk (MCPTT) service
and its interaction with the network. This includes an analysis of the threats to the service, the security requirements to
mitigate those threats and an evaluation of possible technical solutions designed to meet the security requirements of the
This study will include
consideration of relevant 3GPP specifications, particularly for ProSe
The focus of the present document is to support public-safety use of MCPTT as prioritised by SA#66 (SP-140870).
Some features may not be applicable to MCPTT for commercial purposes (e.g. Ambient Listening).