How do I add a device halfway along a phone wire?

[AlastairSC]

I want to connect a device half-way along a run of phone cable in my hallway. If it was a plumbing job I'd put in a T - what is the equivalent for phone cable?

 

[extopia]

A telephone outlet socket, correctly wired.

 

[Jack The Lad]

If you are wiring the phone cable yourself you'll find plenty of info here.

 

[joer]

Put a junction box where you are taking your extension from. The terminals are marked clear enough on the standard phone sockets. eg L1 L2 for the line.