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This documentation covers Cisco Unified Communications system applications through Release 9.0(1). If you are upgrading an existing Cisco Unified Communications system application, begin by reading the System Release Notes for Contact Center: Cisco Unified Communications System, Release 9.0(1) 
to familiarize yourself with functionality in this new release.
There are two information sites for Cisco Unified Communications Release 9.0(1): this site, for contact center systems and the site for Cisco Unified Communications for IP Telephony systems.
