I was an installer on these FAI systems back in the 90's and I'm still servicing them today in Victoria, Australia.
FAI systems were made by ness security
FAI SGI (early 1990's)
FAI SG2 (middle to late 1990's)
FAI SG3 (2000 → 2006) - Voice model
Guardpost (2007 → today ) Voice, GSM, Microphone, many other features.
for any info contact me at:
pm