When preparing documentation for a customer or trying to survey an existing deployment, I usually ask for a copy of the Voice Configuration files (.vcfg) of Lync \ Skype for Business to see how things are set up.
Currently there’s no option to view the vcfg file in a readable format.
Sure, you can open the vcfg file in a text editor or even a web browser and browse through the xml. Alternatively, you can import the configuration to your servers – but good luck trying to read it between the “Committed” and “Uncommitted” text.
The vcfg viewer is a “PowerShell executable” that runs through the vcfg file and renders it to a readable html file.
Simply run the ps1 file, choose the vcfg file you wish to open, and you’ll have a browse able page to examine the vcfg file: