The 225 is full Duplex and I can't see any reason why it should not work. I can only suggest menu, system settings. restore default, and see if that changes anything.
What exactly is happening when you do a conference call?
Procom have a support section
manual here
http://support.polycom.com/PolycomService/support/cn/support/voice/soundpoint/soundpoint_pro_se225.html
support here
http://support.polycom.com/PolycomService/support/us/support/Contact_Us.html
worth sending them the question they can only refuse to answer or try to charge you!
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