I have in a previous life seen this quite a bit with the PolyCom phones ... people tend to put their phone on the speaker on conference calls and I have seen this type of interference caused by a computer speaker and even a motorola cell phone.  <br>
<br>So I would first force everyone to use the handset 1st ... if that solves it then track down the guilty speaker or cell phone.<br><br>SDR<br>