For the most recent information on recommended hardware platforms, software releases, and firmware versions for Cisco Unified Communications System deployments based on Cisco Unified Communications Manager (Unified CM), frequently refer to the latest Cisco Unified Communications System Release Notes for IP Telephony available at the following location:
Note The platforms and software versions recommended in the System Release Notes for IP Telephony are not the only supportable deployment options. They represent the combinations of hardware and software that Cisco has subjected to the most extensive system-level testing. This ongoing testing is conducted using a variety of deployment models, several end-station size categories, and realistic call flows, traffic patterns, and use cases. For information on other possible hardware and software options for Cisco Unified Communications deployments, contact your Cisco account representative.
For additional information on the Cisco Unified Communications System, refer to the documentation available at: