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本帖最后由 商务车 于 2012-12-22 13:32 编辑
future2521 发表于 2012-12-22 12:39 
车兄用什么手机客户端带Penny Tel啊?,我下载了一个Acrobits
里面的G.729模式,居然还要收费,我了个去 ...
其实不是一定要买729的,普通使用的话,iLBC也够用了。
iLBC
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iLBC sits between G.711 and G.729. iLBC uses slightly more bandwidth than G.729 but results in better call quality. It's very hard to distinguish an iLBC call from a G.711a call. iLBC uses on average 24kbps ( so 4kbps more than G.729 ) and uses more CPU than G.729, but it results in noticeably better audio quality than G.729. iLBC also is a free codec and does not require any licenses. On an ADSL1 connection, you would be able to conduct ( 220kbps divided by 24kbps ) = 9 simultaneous calls using the iLBC codec.
The drawbacks of using the iLBC codec are :
- iLBC is not as widely supported by VSPs as G.711a and G.729.
- iLBC uses even more CPU cycles than G.729 / aLaw. |
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