This article relates to Cisco IP Video Phone E20.
Q. Do I need TANDBERG infrastructure products in order to use the TANDBERG E20?
A. The TANDBERG E20 is a SIP only device and needs to register to a SIP registrar. In a video conferencing environment this would be managed by a TANDBERG VCS. In a VoIP environment this would be a compatible SIP IP-PBX or Microsoft OCS (R1 only in first release).