Disable the Advanced Calling button: registry value NoAdvancedCallingUserHKCU\Software\Policies\Microsoft\Conferencing

Policy ID

DisableAdvCallingButton

Scope

User Configuration

Supported on

at least Windows NetMeeting v3.0

Source

Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)

Category

Windows Components › NetMeeting › Options Page

Registry