Yes, the good old PSTN copper lines and the ISDN delivered on Copper (ISDN 10/20/30 and ISDN 2 – ON RAMP) are all going to be removed in the near future, with some services already removed in some areas.
You should act now and take steps to switch to SIP lines and upgrade your systems so you are not cought at the last minute before they are they are turned off for good.
Better to plan ahead, over being caught out at the last minute. We are here to help and make the transition smooth and easy.