IP Office doesn't support digital Polycoms, so your options are an analog Polycom or an Avaya IP conference phone. The SIP variant is the B179 and the H.323 variant is the B189. I prefer the B189 but it's more expensive.
The type of phone and trunk are mutually exclusive. You can use any type of phone (analog or IP) with your existing trunks. The VCM module in the IP Office performs the media conversion between TDM and IP. Be aware that any IP endpoint requires an endpoint license in the IP Office.
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