When we first got our hands on a Catalina Communicator Phone we plugged it in and it worked straight away as an audio device, but it did not work as expected. The presence indicator did not light up, picking up the handset did not answer an inbound call and placing it back in the cradle did not end a call in progress.
I searched around for an answer and came up dry. We figured it out in the end, but when I came across a new MS blogger today I discovered that his very first post was on this issue.
On http://www.microsoft.com/uc/partners_hardware.mspx you will find a number of devices, which have been optimized for Office Communicator 2007. Being optimized for Office Communicator 2007 means that the device implements a number of features, including wide band audio, presence state icon and Human Interface Devices (HID) commands like mute, speaker phone, off-hook etc.
However, even if the device you are using implements these features, they might not work for you when using Office Communicator 2007. The reason is most likely that you are not enabled for Enterprise Voice in OCS 2007.
The subsequent post have me convinced - a blog worth adding to the feed list.