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CUCM Codec Configuration

To conserve IP WAN bandwidth, low-bandwidth codecs, such as G.729, should be used in the IP WAN. For calls within a LAN environment, high-bandwidth codecs, such as G.711or G.722, should be used for optimal audio quality. When choosing the right codec for your configuration, it is important to remember that low-bandwidth codecs, such as G.729, are designed for human speech; they do not work well for other audio streams. For example, the audio quality of G.729 can sound poor when used for Music On Hold (MOH).

As stated previously, other methods exist for limiting the bandwidth required for MOH streams. If multicast MOH from branch router flash cannot be used, but MOH streams are not desired on the IP WAN, MOH can be disabled for remote-site phones.


  

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