Q: Why does Studio not call my VCU after clicking MAKE CALL?
A: Studio makes secure calls to all VCU systems by default. Not all VCUs are configured to accept secured calls, so an insecure call must be made in order to connect to the unit.
To make an insecure call to a VCU you must add sip: before the unit's URI. This defines the scheme of the call and allows the insecure call to be made out to the unit.