I have CISCO SPA112 adapter.
Line quality was decent, drops ones in a wail.
In last 10 days, ones or twice a day, phone rings one time, I tried to answer but couldn't.
Phone get blocked with "check line" on display.
After some time, 15 min or so, line is on, and I can use it normally.
In mean time I upgraded firmware to newest version 1.4.0.
Nothing changed, call dropped again today.
Any solution?
Thanks