Many of the VUC regulars have experience in this area so the details of provisioning have been the topic of VUC discussions a couple of times.
Michael Stanford of WiRevolution recently posted a nice series he calls The HD Voice Cookbook. It’s essentially a guide to provisioning Polycom phones, in has case a Soundpoint IP650 he installed in his own quest for wideband capability in his home office. It’s a good reference for anyone facing this task for ths first time.