You can use the one-X Call Assistant pop-up to hold calls.
•Held callers hear music on hold if available. The music heard depends on the phone system's configuration. If no hold music is configured, the caller will hear a double beep tone every 4 seconds.
•The Hold Timeout for all held calls is set by the system administrator. By default it is 15 seconds but it can be changed or switched off. The returning held call ignores any forwarding or do not disturb settings. You cannot drop a hold reminder.
•If the system administrator has configured you for Busy on Held, while you have any held calls, the phone system will treat you as being busy to further incoming calls.
To hold a call:
1.Click on the 
Hold icon. The call is put on hold. The pop-up indicates that the call is held.
To take a call off hold:
1.Click on the 
Retrieve icon next to the call details.