1. We had an oversubscribed WAN link between the 2 phones experiencing the problem - causing too much latency and jitter.
2. We had buggy phone firmware - upgrade fixed it. This was back around ccm 3.1 though so this particular bug would have been fixed along time ago, not to say there isn't another now that reports the same error.
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.