Audio & Video Cables & Adapters
RJ11 6P4C TO 4PIN / RJ9 4P4C TO 4PIN SOLDERLESS CONNECTOR WIRE END SHIELDED CABLE
RJ11 6P4C TO 4PIN / RJ9 4P4C TO 4PIN SOLDERLESS CONNECTOR WIRE END SHIELDED CABLE
https://www.bizrate.co.uk/audio_videocables_adapters/rj11-6p4c-to-4pin-rj9-oid30354316912.html