Convert 3 5mm stereo to RJ11 audio

I would like to do something unusual:
I would like to merge 3.5mm TRS (stereo) audio into an RJ11 phone connector; to enable listening of audio while on phone calls or when phone calls are not active. Is there any way to do this?
The only thing I have seen available is the Omnicron MOD-SC converter (RJ11 jack to 3.5mm mono).
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More about convert stereo rj11 audio
  1. You need to be a bit careful when connecting an audio output into the phone line. There's DC voltage on the line for the ringer. I suspect the phone company will send you a big bill if they find you've affected the network by attaching unapproved equipment.
  2. LOL. No I'm not trying to ruin my phone system... although my idea just might do that. I just want to take a few audio outputs from my computers and mix them in with my wireless phone headset that is connected to my phone line. I guess this idea is not possible? It seems like I should be able to do this, as I am not adding a signal to the phone line but a merged signal to the headset only. There has got to be a way to do this.
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