I'm not aware of any specific integration available for the UC560, but Cisco does produce two plug-ins for IBM Sametime that work with Cisco's enterprise-grade UC offerings. http://www.cisco.com/web/partners/pr67/pr30/IPC/unified_commManagerPlug-In_Info.html
The Phone Control and Presence (PCAP) plug-in for Sametime offers click-to-dial, click-to-conference, call control and phone presence functions, working with Cisco Unified Call Manager and (optionally) Cisco Unified Presence servers. http://www.cisco.com/en/US/docs/voice_ip_comm/cucibmlotus/cpcap/8x/english/release/note/cpcaprn851.html
The Unified Messaing (UM) plug-in for Sametime allows users to view, play, forward and manage voice messages from within the Sametime interface. It works with Cisco Unity and Unity Connection servers. http://www.cisco.com/en/US/docs/voice_ip_comm/cucibmlotus/unifiedmsg/8x/release/notes/cumstrn851.html
Both plug-ins work with either the standalone Sametime client, or the version embedded in the Notes 8.5 client. There is no charge for the Cisco plug-ins (although I'm not sure whether they're provided as an entitlement with some other license). To install Sametime plug-ins in the Sametime/Notes client, each user needs to have a Sametime Standard license.
I'm unfamiliar with the UC560. If it provides an IMAP interface for voice mail, I'd guess there may be a chance of getting the Sametime UM plug-in to work with it. I would be quite surprised if the PCAP plug-in works with the UC560, as it has been coded with some fairly specific hooks for CUCM and CUP.
Please reply if you have further questions.
IBM Collaboration Solutions Architect