Locking or unlocking a call In Zoom App

You can lock a current call if you are in a shared line group or are involved in a call delegation setup. Several specific functions will be disabled in different shared lines:

  • You won’t be able to do any of the following if you lock your call in a shared line group:
    • You can’t pick up a call that has been placed on hold for other users.
    • The other user cannot listen, whisper, or barge into the call.
  • A locked call will prevent these actions if you are the delegator:
    • If you place a call on hold, make sure no one else picks it up.


  • If you wish to utilize Zoom on Windows, macOS, or Linux, you will need version 5.7.6 or higher
  • If you wish to utilize Zoom on Android or iOS, version 5.7.6 or higher
  • The Zoom Phone software is required
  • Whether that be part of a shared line group, or if the call delegation setup allows it, a delegater
  • Can enable the call delegation privacy feature when it is part of a shared line group.

How to lock or unlock a call


Shared line groups allow you to lock or unlock calls received or made by other members of that group only.

  1. Log in to Zoom on your desktop or on your mobile device.
  2. You can now make or receive calls.
  3. You can reach the in-call controls by clicking or tapping More.
  4. To lock or unlock the phone, simply click or tap.
    Upon receiving a notification, you will be able to see whether or not the number is locked or unlocked.

Results of locking a call

  • A small eye icon is shown on the Lines tab directly below the relevant line in the chart. Besides the user who is part of a shared line or call delegation setup, other users of that same shared line group will also see that icon.
  • During the time that you are locking the phone, any other phone monitoring the call will remain in the call.
  • An unmerged call can be added to (or started as a three-way call), but you cannot merge a locked call.