[lug] Telephone Connection

[David]

We are having a second telephone line installed tomorrow for dial-up
use.  Can anyone tell me which lines normally are used, please?  The
current voice line uses red and green on the centre two of the six
socket connectors.  The extension line to the telephone only has those
two connections.  Are alternative connection extension lines readily
available, or do I need a full six connector line?

dajo