The maximum number of monitored lines is 50 but you should consider bandwidth. The maximum may also be determined by the number of line buttons on the user's phone.

1

From the customer view in https://admin.webex.com, go to Users, and select the user you want to modify.

2

Select Calling and then go to Monitoring.

3

Choose whether you want this user to be notified about parked calls, search for the person to be monitored, and then click Save.