5pcs RJ11 Socket Splitter RJ11 Male To Female Adapter For Landline Telephone - Walmart.com
Amazon.com: Uvital Phone Jack to Ethernet Adapter, RJ11 to RJ45 Adapter, RJ45 Female to RJ11 Male for Landline Telephone, with RJ45 to RJ11 Cable (Black,2 Pack) : Electronics
RJ11 6P4C F-2F Modular T Adapter, White — Tera Grand