Advanced - Behavior (Tab) - Keys (Section)__Cancel Key on Held Call
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<cancel_on_hold perm="PERMISSIONFLAGS">VALIDVALUE</cancel_on_hold>
When this option is set to ‘off’, a call on hold cannot be cancelled by pressing the CANCEL button , but has to be taken up again and then canceled. This prevents the accidental cancellation of calls on hold.
<on>, <off>
off