Starting in v42, you will be able to use call park in your OneCloud browser-based WebPhone.

A new menu has been added to monitor your parked calls:

Calls can be added to your desktop work area as well.

You can dynamically, or selectively park calls for any call on your domain. Dynamically parked calls will be placed in the next available empty call park.

On the active call screen, you will now see an option to park the call.