I haven't used skype in a while but the following should work:
Quill, that's absolutely perfect, thanks!
It's implemented, tested on a few scenarios and working well, especially allowing high quality speech which surprisingly was a problem on their default config. I was also being scanned by various IPs, could have been Skype, or not, I have yet to look them up them fully.
Much appreciated that you took the time to spell it out step by step. Thanks again.
Bulgroz, thanks for that suggestion also. I tried that a couple of times, but in tightening things up, I ended up blocking services, hence the need for the detailed step by step approach.