External mic inputs and speaker outputs for CP-7937G Conf Phone

Has any tried to connect the Polycom® SoundStation IP Multi-Interface to the Cisco Conference Station CP-7937G Phone, it appears to be the only way to get eextra mic inputs and line level outputs for enhancing conference call?  See attached Quick Start Guide.

Here's where I am on interfacing external mikes, PCs, speakers, etc. with the Cisco 7937. It seems this I/O port is quite a mystery to both Cisco and the manufacturer (Polycom). There are virtually no technical specs for it anywhere on line. So, I bought a variety of cables and connectors and tried exploring. I could never get anything but input into the 7937 to work. I could never get any output from it despite the output symbol next to the port. Here are the input test results:
3 pole 2.5mm to dual stereo 3.5mm breakout cable didn't work at all
4 pole 2.5mm to stereo 3.5mm for input worked only on one pole (red connection). Half volume?
3 pole 2.5mm to stereo 3.5mm for input works only on white connector (louder?)
3 pole 2.5mm to mono 3.5mm for input, works (louder?)
2 pole 2.5mm to stereo 3.5mm for input, works
2 pole 2.5mm to mono 3.5mm for input ,works, and is simplest.
So, if you want to feed an external audio source into the Cisco 7937, almost any type of 2.5mm male connector cable at the 7937 will work
I could never find any mention of successful use online, and could not find an output signal myself, so I suspect the 7937 was just mislabeled.

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