Sony PCS-3000 Operating Instructions Manual page 74

Ending a Meeting
3-12
Chapter 3 Conducting a Meeting
3
When you are operating from the MAIN menu, select [HANG UP] if
you want to disconnect the line and continue performing other
operations. Select [SYSTEM OFF] to set the system to the standby
mode.
To continue your meeting, select [END OF MEETING] again in
step 3.
When you end your multi meeting
If you have held a multi meeting, the icon [HANG UP] is changed to
[HANG UP ALL]. Select [HANG UP ALL] to end a meeting.