How can I connect the 3.5mm output on my smartphone to a Phone line input?

I want to be able to listen to music from my smartphone on a wireless headset at work. The headset is designed for use with a telephone, and requires a typical phone line input (not sure what these plugs are called). I have checked radio shack and other locations for a cable or combination of cables that would accomplish this, but have not had any luck. Please help!! Thanks!

A ‘normal’ telephone plug is called a RJ11 connector. I do not believe there are RJ11 to 3.5 mm jack adaptors.

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