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G.729a
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G.729a is a simplified version of the G.729 codec. It's 100% interoperable with G.729 but has been greatly simplified. Most hardware supports the G.729 codec and most VoIP Service Providers (VSP) support it, so it makes sense to include this codec in the comparison. The G.729 codec uses on average 20kbps upstream and 20kbps downstream per call ( not including encapsulation overhead ). On an ADSL1 connection you would be able to conduct ( 220kbps divided by 20kbps ) = 11 calls, instead of 2 calls. But it comes at a price : The sound quality of a G729 call is noticeably less than a G711 call.
There are some drawbacks to using G.729a codec :
- G.729 is very CPU intensive
- G.729 sound quality is noticeably lower than G.711a.
- G.729 codec requires licenses ( 10 dollars per channel on Asterisk )
原文:INFO: Codecs : G711 vs G729 vs iLBC
链接:http://forums.whirlpool.net.au/archive/1413041
btw, I just bought a 729 codec package on my iphone for $10.49 installed in Groundwire(also $10.49) sip voip software for test....... |
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