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Much to my dismay, this product does not actually seem to support AMR-WB or G.722.1
You are the only person who has ever expressed any interest whatsoever on those CODECs. I can't fathom any reason to be "dismayed" about it. As we discussed over a year ago, fixed VoIP implementations aren't using adaptive multi-rate G722.x CODECs; they are mainly being used for mobile calls. Opus is the wideband CODEC of choice for fixed VoIP. One major example of standardization on Opus is the WebRTC platform built into Google Chrome and Firefox browsers. This enables easy implementation of wideband calling at the application layer, and it's what Google Voice's website uses.
Aside from that, those two G.722.x CODECs are now (well, as of 2014) superseded by the Enhanced Voice Services (EVS) CODEC. I doubt that anything other than Opus will be added to Poly phones in the near term, regardless of what their spec sheet says. Contact Poly yourself for further questions on their CODEC support.
I suggest you do some web searching to learn more on this topic.