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OTOTEC 2pcs BT Plug to US RJ11 Socket Telephone Cable Adapter Conversion Connectors 6P4C Phone Line Straight Through Adaptor White : Amazon.co.uk: Electronics & Photo
2 Pack ) Short Telephone Cable RJ11 Phone Line Cord. 5, 6, 8, 12, 18, 24 inch | eBay
RS PRO Male BT to Female BT Telephone Extension Cable, White Sheath, 3m | RS
SHONCO Telephone Cable Adapter,1 to 2 RJ11 Y Splitter with RJ11 6P4C Plug Cord,Expansion Connectors for Telephone,Fax Machine (2 PCs,Black) : Amazon.co.uk: Electronics & Photo
BT Telephone Line Cable Adapter from RJ11 Socket Female Jack to BS6312 431A Male Plug | British UK Modular Standard Connector to 6P4C for RJ11 universal lead | 4 Wire Converter | White | Keple.com
4 Wire BT Plug to RJ11 Crossover Telephone Cable 3m White | CPC