This 3GPP Technical Specification (TS) specifies: 1. The interactions between the MCPTT User Database and the MCPTT Server. This interface is referred to as the MCPTT-2 reference point. 2. The interactions between the MCPTT User Database and the Configuration Management Server. This interface is referred to as the CSC-13 reference point. The functional architecture for support of mission critical communication services is specified in 3GPP TS 23.179 [2].