This cable can be used between an analogue modem and an ordinary telephone. Or between a telephone/modem and a wall socket with an RJ11 or RJ45 connector.
Sandberg Telephone RJ11-RJ11 10 m BLACK
Sandberg Telephone RJ11-RJ11 10 m BLACK. Cable length: 393.7" (10 m), Color of product: Black. Package width: 3.54" (90 mm), Package depth: 1.97" (50 mm), Package height: 8.07" (205 mm). Connector(s): RJ11/RJ45