The common functional architecture for support of Mission Critical (MC) services is specified in 3GPP TS 23.280 [21]. The functional architecture for support of Mission Critical Push To Talk (MCPTT) services is specified in 3GPP TS 23.379 [18]. The functional architecture for support of Mission Critical Video (MCVideo) services is specified in 3GPP TS 23.281 [19]. The functional architecture for support of Mission Critical Data (MCData) services is specified in 3GPP TS 23.282 [20]. This 3GPP Technical Specification (TS) specifies: 1. The interactions between the MC Service User Database and the MC Service Server: - This interface between the MCPTT User Database and the MCPTT Server is referred to as the MCPTT-2 reference point@ as specified in 3GPP TS 23.379 [18]. - This interface between the MCVideo User Database and the MCVideo Server is referred to as the MCVideo- 2 reference point@ as specified in 3GPP TS 23.281 [19]. - This interface between the MCData User Database and the MCData Server is referred to as the MCData-2 reference point@ as specified in 3GPP TS 23.282 [20]. - This interface between the MCData User Database and the MCData Server is referred to as the MCVideo-2 reference point@ as specified in 3GPP TS 23.282 [20]. 2. The interactions between the MC Service User Database and the Configuration Management Server. This interface is referred to as the CSC-13 reference point.