Modular Adapter (DB9 Female to RJ11) - Micro Connectors, Inc.
1-Wire Bus 1x1 Coupler, 6P4C (RJ11) Connectors - Sealevel
RJ11 Duplex Jack Adapter - Ivory
2 Pack) RJ45 to RJ11 Adapter Converter Cable 6ft RJ45 8P4C Male to RJ11 6P4C Male Gray - 6 Feet - Walmart.com
RJ11 One Male to Two Female Modular T-Adapter
Amazon.com: RJ45 to RJ11 Cable, 6 Feet Phone Jack to Ethernet Adapter RJ11 6P4C Male to RJ45 8P8C Male Connector Plug Cord for Landline Telephone : Electronics
Modular Adapter Kit DB9 Female to RJ11 RJ12 Beige | Computer Cable Store
10pcs RJ11 to Screw Terminal Adaptor RJ11 Male to 4 Pin connector RJ11 splitter for CCTV DVR CCTV accessory|4 pin male|4 pin splitter - AliExpress
Amazon.com: RetailAndBulk 2-Way RJ11 Splitter Female to Female 6P4C Telephone Line Adapter with Cable (Black, 2-Pack) : Electronics
QD to RJ11 adapter cable + universal switch – TELLUR
Telephone Adapter RJ11 Plug to BT Socket Male / Female Modem 4 WIRE Stub Lead 5056255313407 | eBay
Amazon.com: Xsusmdom [2-Pack] Phone Jack to Ethernet Adapter, Ethernet to Phone Line Adapter RJ45 Female to RJ11 Male Converter Adapter Cable for Landline Telephone Service : Electronics