
Gigaset Telefono A690 Duo Iberia Blanco

Gigaset Telefono A690 Duo Iberia Blanco
I have two Gigaset Comfort 500 HX (duo), n°1 is on the base connected to the 230 v mains and via the cable to the telephone line. No. 2 is on a small base connected only to the mains. Is it possible to connect the A690, which is connected to the mains but not via a telephone cable, as No. 3? According to the documentation, the A690 also has a socket for the telephone line, but I don't know how to connect the telephone line.