Taking a quick look in the "tech tips" database, there's this about systems that aren't responding to DTMF:
There is a command that can be entered on the router to address this. It is "DTMF -RELAY - H245 - ALPHANEMERIC". If the customer is not familiar with this command, please refer to CallManager notes for resolution.
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.