Use the process above to upload the ISO file to the datastore.
Using the vSphere client, select the Inventory view.
Locate the required virtual machine in the inventory navigation tree on the left. If not shown, select View > Show VMs in Inventory
Click on the virtual machine.
Click on Connect/disconnect the CD/DVD device of the virtual machine in the toolbar.
If already connected to a source, the details are shown and the option to disconnect. Select disconnect and then click the icon again.
From the drop-down, select CD/DVD drive 1 and then select Connect to ISO image on datastore.
Select Datastore ISO File and click Browse.
Select the ISO file and click OK.
Next Steps
You can now download the ISO to the virtual server using the DVD Primary Server option in the IP Office Web Manager menus. See Downloading the ISO from the primary DVD.