We changed IOS version on Cisco 5350 from 12.2(2)xb5 to 12.2(11)T2.
Now we see, that value of 'h323-voice-quality' of calls is greater, than earlier (value 37 instead of 10). What does it mean, that quality of service is really worse, than earlier or ...?
Also command 'sh call h v b' print uncomfortable report (It was better)
My search for the bugs for cisco IOS version 12.2(11)T2 on voice quality yeilded the following results.
Many of the bugs like CSCds74456 in the search results report poor voice quality with cisco IOS version 12.2(11)T2.
The Cisco IOS version 12.2(11)T2 is not a stable version.It is an early deployment release. I would suggest you to go in for a reliable and stable version which is a GD(General Deployment)
You can get one from the software center by selecting the feature set you require. The link to the software center for the major release 12.2 is
Hope this helps.