{{{{{Welcome}}}}} laid this down on his screen :
> Thus spaketh dmitri:
>> I have 3 BT extension sockets, broadband and VOIP GATEWAY 102 which
>> has two RJ11 - one for analog phone and one for PSTN. How can I
>> connect all three analogue telephones to share ATA?
>
>
>
> Get an RJ11 plug and wire it to a BABT master socket, then wire two extension
> sockets to the master socket.

BT Master to Gateway.

Gateway to BT Extension wiring.

Job done