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.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...