External Telephone Relay

Hi guys

Hoping someone can help me out. I’m looking for an external telephone relay to trigger an I/O port on a USB interface. So that when our telephone rings in our studio it sends a signal to our studio Clock software and lights up the phone led to let presenters know that there is a call coming into the studio.

I’m told I need some sort of relay connected to our existing phone line with an output connected to our USB interface that will listen out for a signal to trigger the LED on the software.

Input ports on the interface are 1/4" stereo jack sockets. If anyone can tell me exactly what I need to get it working it would be greatly appreciated

Many thanks in advance
Mike

You may want to look at the K8086.
http://www.vellemanusa.com/products/view/?id=523820
This is a kit soldering required.
Manuals can be found here.
http://www.vellemanusa.com/support/downloads/?code=K8086

Of the VM144 (same thing just assembled)
http://www.vellemanusa.com/products/view/?id=524141
Manuals
http://www.vellemanusa.com/support/downloads/?code=VM144