Call center supervisors do not let agents to change the queue once the agents assigned to queues. Queue toggle (login/logout) option in 3CX phone client should be an admin privileged option.So user should not be able to change or logout from queue without supervisor/admin permissions.This is a mandatory requirement in call center operations. Even a basic call center solution support this access controlling feature where supervisor/admin has control on queue operations. With 3CX client, agents can change the queue as per their preferences and even they can easily logout from queue via just one click on queue toggle button. Even this can be happen mistakenly. For large call centers, its is not possible for supervisors to strictly monitor agent queue status by agent by agent.