2 Pack) Black RJ9 4P4C Straight or Reverse Cable. Custom Size From 2" - 10ft | eBay
D-sub 9 Pin 9p Db9 Female To Rj9 Rj10 Rj11 4p4c Plug Rs232 Serial Communication Cable, Rj9 Rj11 To Com Db9 Female Connect Kable - Pc Hardware Cables & Adapters - AliExpress
Amazon.com: NECABLES 2Pack Short RJ9 Cable 1ft 4P4C Phone Cord Telephone Cable RJ9 / RJ10 / RJ22 4P4C Male to Male Straight for Both Data and Voice Black - 1 Foot : Electronics
Converter Adapter | Converts RJ-9 to 2.5mm for phones that have a 2.5mm jack., (2200-11095-002) | Use with APP-50, APP-51 EHS for Polycom, Connecting telephone devices to 2.5mm headset mini jack
Cable RJ-9 4 Contacts A RJ45 Telephone RJ-45 A 3 Contacts Plated Adapter | eBay
Jabra Phone Cable (flat Cord With Modular Plug Standard Rj9 To Rj9) 14201-12 : Target
Amazon.com: NEORTX RJ9 to RJ9 Cable 6.5ft, RJ9 Male to RJ9 Male 4P4C Telephone Cord Handset Cord Telephone Handset Coiled Cord Cable Telephone Spiral Cable (White) : Electronics
Amazon.com: RJ9 4P4C Telephone Cord 10 Ft. Compatible with AWS Ship Elite Scale Ten Foot : Electronics