Direct SIP connectivity with OCS and Cisco UCM v4.2, 5.1 and 6.1
Cisco Unified Communications Manager (aka CallManager) version 4.2, 5.1 and 6.1 (specific version/release below) is now certified for Direct SIP connectivity with Office Communications Server.
Direct SIP allows connectivity between the OCS mediation server and the Cisco IP-PBX without the need for a gateway, meaning that Office Communicator users can be enabled for Enterprise Voice (i.e. Office Communicator is a full soft-phone, not just click-to-call or RCC) without significant upgrades or hardware replacements.
More detail at http://technet.microsoft.com/en-us/office/bb735838.aspx
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