Over the years I have been slowly writing a node module to help me write SIP functional/integration tests: https://github.com/MayamaTakeshi/sip-lab I have been adding new features as I needed for new kinds of test but didn't have time to document it. But now I need to mentor some newcomers to the company I work for and had to do it. I asked gemini to do it for me and got: https://github.com/MayamaTakeshi/sip-lab/blob/master/DOC.md
It might be of help for other people so I am sharing it.