I have taken a Sony SPP-A941 900 MHz phone our of a retirement to replace my DECT 6.0 devices which we cant get to work without the crackling overpowering all conversation on all the handsets.

The SPP-A941 base unit has completely forgotten the handset in the numerous years it has been out of use.

Ringing in causes the base station to ring and the handset to beep 4 times. So there is some sort of rudimentary communication going on

Pressing any other button on the hand set causes the handset to beep 4 times with no dial tone despite numerous resets. Sony tech support was completely clueless (in anything beyond reading the manual to me and trying a few basic stops like unplugging and plugging the various parts in again).

There IS a button on the handset which is supposed to switch channels if reception is no good. Not apparently for when you get no dial tone whatsoever..

Is there any way of getting the base unit to link up with the handset please?