It worked fine with the Polycom phone
Discover D904 Convertible DECT Wireless Office Headset For Professionals
They changed the rubber ear piece. Aside from that, I love my new headset.
By investing into and purchasing the C225 Headset have instantly advance me into today's ways of communicating with the privacy of listening and communicating without being disturb or disturbing others.
EASY TO SET UP AND USE. CLEAR SOUND