This quality Belkin Pro Series Double Adaptor allows you to turn one modular socket, into two modular sockets.

Advantages :
One modular RJ11 plug to two RJ11 jacks.
Converts one wall jack to two, allowing two phone devices to be plugged in.
4-wire construction for handling up to two separate phone lines.
High Micron plating on RJ11-type connector and female jack help maintain clearer conversations.
Ivory color coordinates with phone jack and cords.
Guaranteed to work for life!
Lifetime Warranty