Lets back up here for a moment. Does the player have decent sound without being connected to the phone system? Moh is only as good as its source.

Hooking up an MOH player to an STS isn't rocket science. Its two wires to two pins, one pin over the other one =

Stereo headset cables can have three wires, red, white and a common. Use the common and one of the other two it doesn't matter. No one on hold is going to know they are listening to left or right channel.

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"Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about"

Retired, taking photographs and hoping to fly one of my many kites.