I have made som comparision between 7925 and 7921 for a customer with problems with quality on 7925's.
We encounterd audio problems on 7925 even with a good RSSI higher than -67 Dbm. We changed out one user for a old 7921 which worked much better. The audio quality seems also a lot better on 7921 also when roaming.
Also from what I gather from TAC is that the 1.3.3 is the most stable software right now. 1.4.1 issues sometimes is resolved by going to 1.4.2 but if not 1.3.3 is the safest bet.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
for changes every so often Please feel f...