LevelOne VOI-7100 - Manual (Page 48)

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Codec ID
You can setup the Codec ID in this page. You need to follow the ITSP
suggestion to setup these items.
Note
Two VoIP devices with different Codec ID will cause the
interoperability issue. If you are talking with others got
some problems, you may ask the other one what kind of
Codec ID he use, then you can change your Codec ID.