Kevin,This is like a codec issue, you can configure voice class codec under voice service voip.voice class codec 1 codec preference 1 g711ulaw codec preference 2 g729r8 video codec h264
Check License status on your CUE, I had same issue.. Finally figured out its about license.. sh license status Sent from Cisco Technical Support iPhone App
Hi Alicia,Its not possibel right now.. C 20 is SIP device, and its Video Conferencing device, so you may call C 20 using your IP communicator or Video IP phone, but not through the webex.