You can lock or unlock a conference from the in-meeting menu options if you have the permissions enabled by a system administrator. 

  1.  Join a call.  After you join, open the Meeting Controls side bar.
  2. Under Security, click on the Conference lock. 
  3. To unlock, click on the same icon.

Note: You can lock a meeting for security purposes to temporarily restrict guest access. Restriction only applies for the duration of the meeting. Members of a space are not affected, and can join the space at any time.

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