I have 2 7921G phones registered to a CUCM 7.1.5 server through a WAP4401N V2 running 220.127.116.11
|PID VID:||WAP4410N-A V02|
Inbound signalling to these phones experiences serious delays - a phone that is 8-10 feet from the AP (i.e. 5 bars, full signal, etc) will experience a several second delay in starting to ring on an inbound call(as compared to a 7961 sitting right next to it), and after the call is answered on the hardphone the 7921 will continue to ring an additional 10-20 seconds.
Taking the 7921 offhook is immediately indicated on the 7961, so the delay seems to be entirely from the wired network out to wireless clients.
If I home the phones thorugh a buffalo 54g AP, the phones are as responsive as a 7961, the problem is absolutely localized to the WAP4410N.
When is a firmware coming that will fix it.