The following is a link to a list of the currently supported devices for Microsoft Office Communicator 2007. Using 'certified' devices is important to achieve the best Quality of Experience when making and receiving audio calls with Office Communicator (OC) As well, they provide a true plug and play experience without having to mess around with drivers and sound control panel settings.
Also listed here are the Office Communicator Phone Edition Devices that are a 'networkable' phone requiting only a network connection to utilize Office Communications Server 2007.
Have a look at some of these devices here. I plan to review some of these devices in upcoming blogs.