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Links: ·ALL ·Review Your VoIP Provider ·VoIP Providers ·VoIP FAQ ·Porting Rules ·What Codec?
The Truth About Universal Service Fund »
« Real world opinions of TelePacket  
AuthorAll Replies

mchung55

join:2003-09-04
Lisle, IL

reply to wiggles4
Re: Who uses what Codec?

Here are some example of voice quality MOS (Mean Opinion Score) scores collected before. G.711 has the best voice quality. However, you need to pay for the price of high bandwidth.

1. PSTN switch: MOS is closed to 4.5
2. G.711 A/M: 4.4 or up
3. G.729: About 4.0
4. G.723: About 3.5
5. G.726: If I remember correctly, depend on its rate, the score is between 3.5 to 4.3.
to forum · permalink · · 2004-10-18 14:00:59 · Reply to this
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