I have recently moved into a new office building and the previous owners have already installed a system. They were using ISDN lines and so I assume the interface card is for ISDN. I intend to use PSTN and I am looking for help/information. Do I need to buy a new interface card? If so, where can I get one. Also, how to I programme the system. Very little information online.
Many thanks
GFoy
Many thanks
GFoy