Telephone DK travel adapter for standard RJ11/P4C telephone cable
USB 2.0 to Rj11, USB A Female to Telephone Network 6P2C RJ11 Male Plug Adapter | eBay
Aktudy HW-RJ11 USB to RJ45 Network LAN Connector Extension Cable Signal Amplifier - Walmart.com
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: 3.5 Feet RJ9/RJ11/RJ12 Headset Adapter Extension Cord Quick Disconnect Release Connector from Male to Female 4P4C RJ9 Plug for Plantronics, Jabra, Desk Office Phones : Electronics
Modular Adapter Kit DB9 Female to RJ11 RJ12 Black | Computer Cable Store
QD to RJ11 adapter cable + universal switch – TELLUR
Amazon.com: XCZZYB Phone Jack to Ethernet Cable Adapter, RJ45 8P8C Female to RJ11 6P4C Male for Landline Telephone Service (2 Pack) : Electronics
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2 Pack) Phone Line Over Ethernet Cable Adapter RJ11 Female (6P4C) to RJ45 Male | eBay
AC164110 - Microchip - RJ11 to ICSP Adapter, PICkit 2/PICkit 3, MPLAB REAL In-Circuit Emulator