Is there an adaptor that allows a 3 5mm headset to plug into a rj11 jack

[Sankey]

I want to plug in a headset into the handset of a phone. All of the headsets seem to be 3.5mm RCA jacks. I'm looking for an adaptor that would allow the RCA jack to be pluged into a rj11 jack.

 

[JAYDEEJOHN]

Try here, hopefully, theyll make one for you.
http/www.ramelectronics.net/audio-video/a-v-switchers/digital-audio-switcher/c10000-c18000-c18007.html?sorter=productname-en-asc

 

[Sankey]

Thank you very much. I'll try that.