Telephone cable extender

RJ11 Dual Ports Desktop Telephone Extension Cable Extender Connector Adapter NCCZ

Ancable BT Telephone Extension Cable 5M, Male to Female 6-Pin Straight Through Telephone Extension Cable for UK Landline Phone Cord Home & Office Fax Modem Extender 6 Wire

MAOZHOU Telephone Extension Cord,10 m RJ11 6P4C Telephone Connection Cable + Coupler + 20 Cable Clip,Straight Telephone Extension Line for Landline Home and Office Fax Modem Extender - Black