20PCS RJ11 Telephone phone Line To 3.5mm Recording Adapter computer recording for record pen|Plug & Connectors| - AliExpress
Telephone line recorder adapter
VEC LRX-40 USB - tele-recorder adapter for phone - LRX-40 USB - Phone Accessories - CDW.com
Analog Telephone Voice Recorder | Digital Telephone Recorder | Telephone Recording Box - Digital Voice Recorders - Aliexpress
Rj11 Telephone Phone Line To 3.5mm Recording Adapter Computer Recording For Record Pen - Audio & Video Cables - AliExpress
Recording Adapter with Telephone Line for Digital Voice Recorder Telephone Adapter Line-in Adapter for Dictaphone Recorder Pen - AliExpress Consumer Electronics
Amazon.com: Telephone Line Adapter for Split the Line to Telephone and Voice Recorder, with Two RJ11 Port for Incoming and Outgoing Phone Connection and 3.5mm Audio Socket to Connect to Voice Recording