Hi
i think you will find the problem on DP which will use the region of g711 , because g711 & g722 enabled phones will prefer g722. I hope to disable the g722 because the below:-
-G.722 and the proprietary "Wideband" codec have more than double the width of G.711. As a result, fidelity is much better, and music even sounds good. It doesn't meet the audiophile's strict standards for a home theatre, but from a phone handset or headset, the difference is striking. Keep in mind that a wideband headset or handset is required to realize the audio performance benefits of G.722. As an added benefit, G.722 consumes the same amount of bandwidth (64 kb/s) as G.711.
The Downside
Not all devices and features support G.722. As such, be careful where G.722 is enabled within your enterprise. For example, problems with call park and ad hoc conferences arise when G.722 is enabled. When you use the enterprise parameter with features such as ad hoc conferencing and call park, change the setting to "Disabled" and update the device pools for the phones.
Enabling G.722 Across the Cluster:-
By default, the cluster is enabled to advertise G.722 as an available codec if both phones support the codec.
Codec negotiation involves two steps. First, the phone must advertise the supported codec(s) to Cisco Unified Communications Manager (not all phones support the same set of codecs). Second, when Cisco Unified Communications Manager gets the list of supported codecs from all phones that are involved in the call attempt, it chooses a commonly supported codec based on various factors, including the region pair setting.
Please also the below bug
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtq97254
Thank you
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