Quote:
Originally Posted by dominicbeesley
I'm thinking something that would allow any one out of ten 'phone be able to dial any other which would then ring.
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Interesting you say ten extensions.
See if you can lay your hands on an old BT Minimaster 3 PABX, they were once very popular in offices etc. they support dialling between up to ten extensions, (and two exchange lines).
They are based on an 8 bit processer chip (Z80 I think) but they are full of relays that clatter like good-uns as you dial. A positive advantage in your application!