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I'm just guessing here but, you'll have better luck if you don't go through a hub. Give the CIT devices direct connections to the computer. Also, some systems have better/faster usb ports on the back of the pc and lesser ones on the front. I think this is no long tru on newer systems. ..You may also want to go through the device manager, delete the CIT and rescan so it'll reinstall it.. maybe better. When you do that, be sure the CIT is connected. ..maybe this'll help your situations. The software needs to have been installed prior to re-installing via the device manager.
Have you checked for the volume? just make a call then press the up key on navigation key then your volume will come up. If still this does not resolve you're problem most likely that is a hardware problem. You can send the product back to the retailer for replacement.