Amazon.com: RJ12 to RJ12 Cable 1m 6P6C Flat Extension Lead Phone Cord Telephone Plug Connector Male to Male Router/Modem to Phone Landline Socket Switchboard Lead Data Plug Wire RJ-12 to RJ-12 (White) :
TrolMaster RJ12 Cable Roll with 100 RJ12 Connectors, – mightyboxsupply
MP009282 - Multicomp Pro - Telephone Modular Cable, RJ12 Plug to RJ12 Plug, 10 m