IIRC Panasonic are stopping their analogue systems and migrating
across to a IP based systems.
Have a look at multimessage. They do a 1x5 and a 2x10 system.
Priced around =A3240 for the 5 way and =A3390 for the 10way.
Both can accept a door entry input and use bog standard DTMF phones.
The only thing they do need are master sockets rather than secondary.
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