Revolabs makes an adapter specifically for C20 / SX20. They use it for their HD wireless microphones. It is a short, XLR female to 4 conductor male 1/8", adapter cable. cable p/n: 07-XLRTO35M4-01
However, that is not sufficient in itself.
The AudioScience mic uses a Crown PZM element, which requires phantom power, and has an output rating of somewhere around -43dB (not certain of that figure). This is typical for a condenser microphone, and it is a bit too soft for the SX20. The input specification on the SX20 mic input is -35dB. This means that the AudioScience won't be loud enough.
So, two issues:
1) You are going to need phantom power. The SX20 provides 12V +/- 1V phantom power, which is not enough to power third party microphones.
2) You are going to need to boost the signal by at least 7dB, or possibly more, in order to have sufficient output from the AudioScience into the SX20.
So you need a mixer or other signal booster, that includes phantom power.
If you have that part figured out, then the Revolabs adapter can be used. Or you can make up your own adapter cable from XLR to 4-pin mini 1/8", using the pinouts provided in the latest SX20 Admin Guide, which can be found at cisco.com/go/telepresence.
Keep in mind that the SX20, like the C20, was designed as a plug-and-play device, rather than an integrator's codec. So there are challenges around using microphones other than the provided ones.
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