As it turns out, the Polycom SoundStation 2 DC for Nortel (Meridian) does not seem to work with anything except a 16-port digital card. Once I switched from the 48-port to 16-port everything was fine.
We are having this problem as well; except instead of hissing, the soundstation picks up the incoming line of another extention (only the incoming, no outgoing). As long as the interface is not powered on, M2616 phone works fine. The minute it is powered on, no dial tone on soundstation 2 or...
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