Assuming you are using MGCP to control your Gateways.
First go to Service > Media Resource > Music On Hold Server, and note the Device Pool assigned to it. The go to your Gateway and note the Device Pool of the GW. Next locale the Device pools under System -> Device Pool, note the Regions assigned to them, lastly go to System->Regions, and make sure that the codec used between these regions is g.711. Somthing to keep in mind however is wheather these Regions are referenced by another devices ie Phones which by changing the codec might change the codec used in your environment. As best practice MOH server should be in its own Device Pool/Region, also are the GWs located at remote sites, and thus the MOH is streaming via WAN? If yes you have to be aware of the significantly more bandwidth consumption by g711 vs g729.
If you are using H.323 to control the GW, the same logic applies as above, but in addition you have to make sure that the dial-peers on the GW are configured for g.711 via either static assignment or voice-class.
We have a centralized topology in Boston and two other regions one in London(UK) and the other one in Menlo Park (CA). The codec used in Boston is G711 and the one used in London and CA is G729. The poor quality is in London and Menlo Park, do you think, I can modify the Codec for those two regions. What else can I do to improve the qulity of the sound other than changing the Codec from G729 to G711?
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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