This is our unit:IPVC-3540-MC03A - software 4.0.31EMP - ver 3.0.5 EMPMP - ver 3.6.17 MPUnder the MCU gui, setting, the "number of SCCP ports has 3 options----0, 15, 30. I have ours set to 15. In our network we have 10 tandberg SCCP 550 and 770 units,...