Amazon.com: RJ45 to RJ11 Cable, 6 Feet Phone Jack to Ethernet Adapter RJ11 6P4C Male to RJ45 8P8C Male Connector Plug Cord for Landline Telephone : Electronics
Quality 2m 4c Telephone Line Rj11 6p4c Connector Phone Cable Pure Copper Wire For Pbx Analog Digital Phone Customizable 1-100m - Telephone Cords - AliExpress
Basetech ISDN, Western Cable [1x RJ45 8p4c plug - 1x RJ11 6p4c plug] 10.00 m Black | Conrad.com
Amazon.com: NEORTX RJ11 to RJ11 Cable 6.5ft, 2 Meters Phone Cord Telephone Line Extension Cord Cable Wire Male to Male RJ11 6P4C Modular Plug for Landline Telephone Fax Machine (Grey) : Electronics
Amazon.com: NEORTX RJ11 to RJ11 Cable 3ft, 1 Meter Phone Cord Telephone Line Extension Cord Cable Wire Male to Male RJ11 6P4C Modular Plug for Landline Telephone Fax Machine (Black) : Electronics