Ok, I've got one that's been boggling me for about a week now. Whenever I do a "simultaneous page" (I-*70) from a single line phone I get a screeching sound for about a second right when I hang up. The page works fine, sounds clear, no feedback, and if I make the same page (I*70) from any system phone, it works just fine. Soon as I use a SLT, I get the screech as soon as I hang up. I've tried it from cordless phones, corded phones, even one of my 1A2 sets. Any non system phone will cause this. The page comes through the system phones fine, then they all screech right after you hang up the SLT. I can't figure it out. I do not have a PA amp or anything, and I programmed the paging line as the last CO port which has nothing connected. I tried terminating it with an 8 ohm and a 10K ohm resistor thinking maybe an impedance mismatch, but if that was the case it would happen when you use a system phone or any phone for that matter. Any thoughts?
