I think its fair assumption at this point that 8821's don't work well for a lot of organizations without a boat load of tinkering. To fill that void in our org we use yealink w52's and have about 200 bases deploying. I'm curious what other companies are using to supplement their wireless phone needs.
We had troubles with older models of 8821 as soon as we upgraded our wireless, since those old phone only really work well on 802.11a/b which SUCK!
After upgrading to 8821G it was pretty much plug and play and we do not have problems with them, but any wireless phone that supports SIP should be a feasible alternative.
Rolando A. Valenzuela