On Thu, 18 Apr 2019 07:27:57 +1000, cantankerous trolling geezer Rot Speed,
the auto-contradicting senile sociopath, blabbered, again:

Simply add up all the individual REN numbers of your telephony devices. If
t comes to 4 or more, you will need to fit a REN amplifier between the BT
master socket and your telephony patch panel.

REN stands for ringer equivalent number.

Not convinced that that matters anymore

In auto-contradicting mode again, senile Ozzietard? Of COURSE! LOL

--
"Anonymous" to trolling senile Rot Speed:
"You can **** off as you know less than pig **** you sad
little ignorant ****."
MID: