I have a Polycom Soundstation 2 connected to BCM 450. I have basically 2 questions. Question 1 - I make a call, then press the conference key on the Polycom, and try to make a second call, but it's not working. The person on the original call can hear me dialing. What am I missing? I have it programmed the way the manual tells me to program it, but it's not working correctly. Question 2 - Can I have more than a 3 party conference call on this thing? Is it a matter of adding intercom lines to it? Thank you in advance.