1) The Windows or Call Manager 4.x train does require a server license for IP Communicator and IP Phones. However, when the Call Manager software is initially purchased, the purchase price includes client access licensing for as many clients as the platform can support. Therefore there are no additional license charges on the server side.
Call Manager 5.x or the Linux train does require server licensing and it is enforced. The customer usually purchases a bulk number of client access licenses and each device takes away points from those licenses. The licensing can be checked In Call Manager Administration under system => licensing.
2) The client does require a license. The license comes with the purchase of the software. This is separate or additional from the server licensing above.
3) Yes the software can be downloaded from
CCO, however, the client still need to be licensed.
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.