RTMT plugin client version does not work with backend system, please un-install current RTMT first, download the plugin from this particular CallManager cluster, then install it and try again!
The instructions sound pretty simple but when I do what it says it still gives me the same message.
Unity Connection Version 8.0.3ES9.21008-9
JRTMT v8.5 (this is the version downloaded from the plugins menu on my CallManager cluster).
OK, so, if I'm getting this straight you're trying to use the CUCM's RTMT for CUC????
If so, what you need to do is to install the CUC RTMT.
If this helps, please rate