What you ask is going to require much more detailed knowledge of the telefoongids system than it does of the IP Phone Services. The input and output from the phones is pretty easy to parse, but I would have no idea how to hook into that webpage to get the results.
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.