As for CUC - you need to define a Phone System. Each PIMG then requires a separate port group configuration. The integration method you select is SIP to DMG/PIMG/TIMG. You then configure SIP security profile, SIP transport protocol, and you can optionally enable or disable MWI, and specify a number of ports. Each port group is assigned an IP address and port extension range. If you choose to disable MWI, you can then configure specific port group configurations dedicated to transmitting SIP MWI requests.
For communication between the PIMG and CUC, you specify the primary CUC address on the PIMG and the communication between them is SIP. On CUC, you just need to configure the telephony-related settings as mentioned above.
The "Primary Proxy Server Address" parameter (on the PIMG) is not used with Unity Connection. You should leave this blank. Have you looked at the Unity Connection integration guide for the PIMG? It lays out all of the variations. The key question is what legacy system are you connecting with. Map that out and follow the procedures. The Introduction chapter will guide you as to which procedure to follow.
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.