CM 6.1 has proved to be stable, obviously it's got bugs and issues, but we have dozens of installs running well.
CM 7.0 is due out in September.
IP-IVR 5.0 is running very well as well.
It is reasonable to upgrade to 6.1, again we have done many of them successfully, similarly with IVR, keep in mind though that there is no direct upgrade of IVR from 4 to 5 and you will have to rebuild the server with windows 2003 and manually import scripts, prompts, etc.
cderen is correct. CM 6.1 is very stable with the exception of a couple of bugs. IPCC 5.0.1 SR 2 is also very stable. The only issues that I've ran into with 6.1.2 are bugs with 7941/61 phones not working properly. A device pack update resolved that issue. Also, side card issues. They're some known bugs with the 7915 & 7916 side cards on CM 6.1.2.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.