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This documentation covers a Cisco Unified Communications system for IP telephony Release 8.6(1). If you are upgrading an existing Cisco Unified Communications system application, begin by reading the System Release Notes for IP Telephony: Cisco Unified Communications System Release 8.6(1) 
to familiarize yourself with functionality in this new release.
There are two information sites for Cisco Unified Communications System Release 8.6(1); this site and the Contact Center System Technical Information Site.
