20m RJ11 Cable ADSL Extension Lead Phone Cord Telephone Plug High Speed BT Internet Broadband Male to Male Router and Modem to RJ11 Phone Socket/Microfilter/Landline Wire (Black): Amazon.co.uk: Computers & Accessories
BeMatik - Curly phone cord and RJ11 4 wire 1m
RS PRO Single-Port RJ11 Female, RJ11 Male Extender, Cat3 | RS
5m RJ11 to RJ45 Cable Ethernet Modem Data Telephone ASDL Patch Lead Broadband High Speed BT Internet Plug 6P4C to 8P8C Flat Network Extension Cord Compatible with Modem, Router, Landline Wire (Black):
RJ11 to RJ11 ADSL Cables - rhinocables.co.uk
Wellco ADSL 10M Modem Cable RJ11 Plug To RJ11 Plug | Spares, Parts & Accessories for your household appliances | 4ourhouse.co.uk
6 Wire Line Cord (3 Metre - RJ11-RJ45 Plug) | 03-4448 | £4.80
BC-64 RJ11 Patchcord Cables - Bel | Mouser
RJ11 Cable ADSL UK BT Broadband Modem Internet Router Landline Phone lead Lot | eBay