Advanced – PLANET VIP-350PT User Manual
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Advanced
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CODEC
The CODECs available on the terminal includes G.711A (64kbps), G.711μ (64kbps), G.729A (8kbps),
G.729AB (8kbps with CNG), G.723.1 (both 5.3 and 6.4 kbps), G.723.1A (both 5.3 and 6.4 kbps with
CNG), and G.726 (both 32 and 40 kbps, and G721 is identical to G.726-32kbps). The default preference
is to prioritize them based on their compressed voice quality: the higher quality it is, the higher priority it
will be. That is the default CODEC preference is G.711μ, G.711A, G.726, G.729A then G.723.1A.
High quality comes in a price: it consumes more precious bandwidth. Take G.711μ for example, it takes
as much as 64 kbps per call, as opposed to 5.3 kbps if G.723.1A is employed. Thus, if you have limited
bandwidth for VoIP, you should consider prioritize those CODECs come with lower bit-rates such that it
will use your most preferred CODEC on making / taking calls.
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