My 'landline' phone comes from my ADSL modem
rather than from the landline wall socket.
(I THINK that makes it a VOIP system.)
The modem WILL allow me to operate
more than one phone but not as many as
I used to be able to run from the landline.
Only ONE phone needs to RING, but of course,
I must be able to receive calls on them all.
Does equipment exist that will boost
the phone signal enough to be able to increase
the number phones connected to the modem ?