Codec selection

Depending upon the bandwidth availability and required voice quality, a codec that produces compressed audio may be advisable:

• A G.711 codec produces audio uncompressed to 64 kbps
• A G.729 codec produces audio compressed to 8 kbps
• A G.723 codec produces audio compressed to approximately 6 kbps

Table 18 provides comparison of several voice quality considerations associated with some of the codecs supported by Avaya products, including the G700 Media Gateway. It should be noted that toll-quality voice must achieve a Mean Opinion Score (MOS) of 4 or above. MOS scoring is a long-standing subjective method of measuring voice quality.