Amazon.com: 25ft Heavy Duty RJ11 / RJ14 Silver Satin 4 Conductor Reverse Wired Telephone Line Cord by Corpco : Electronics
Amazon.com: Sydien 2pcs 25FT RJ11/RJ14 6P4C Telephone Line Extension Lead Phone Cord Telephone Plug Male to Male Connector Plug Cable (Black) : Electronics
Purchase RJ14 Connectorr with stackable side-by-side design from Elecbee