2006年7月1日 · what is the difference between G711a and G711u ?which is better im usinginternode 512/128spantalk, sipme, brown bearbillion 7401vp

2010年3月31日 · What about the difference between G.711a and G.711u? Hi Craig, G711a and G711u are comparable in call quality, one main difference is that G711u is used mainly in USA and a few other countries. In Europe and Australia, G711a is used primarily ( Alaw )

2006年10月30日 · HI I always had poorer quality calls with OZtell using g729 for some reason over other sip servers on the same codec.Last week I changed it to G.711u and have b

2006年5月28日 · G.711u is used within US Select G.711u *only* if you are making lots of international calls to US Why? Within Australia the telco interconnects are mostly ISDN - and G.711a PCM is used for all interconnect encoding. Use of G.711u will result in a *small* amount of call quality degradation due to transcoding. Hope this is useful. dB

2005年1月29日 · Partly is is down to the fact that G.711u (mu-law) is primarily used in the USA and G.711a (a-law) is used in Europe.-----I hope this clears it up, there shouldn't be a quality difference it appears to be just a parity or something similar. Chris.

2006年11月27日 · The Elite Geek writes... alaw is used by Telstra and Optus and the likes. Correct, uLaw is not used in Australia only on equipment that comes from SE Asia or the USA, as they are shipped with uLaw as default in the equipment.

2008年1月31日 · From what I've read G.711u is in use in North America and Japan while G.711a is used in Europe and the rest of the world. G.711a was designed to be easier to process by computer but in testing they produce almost identical results.

2022年8月31日 · I remember 711a was rather rough like you're describing and we went via 711u to 723. 711u is for American networks due to their coding. It sound coarse when connected to a g.711a Australian and rest of world system. G711a is a 64bit codec so pstn phone quality.

2010年8月1日 · Update : I asked Freecall to adjust the settings on their end, to turn off Echo Cancellation and Comfort Noise, and my modem will now handshake at 2400 bps, but the connection once established is useless – all line noise, or unidirectional communication only if using a lower speed like 300 or 1200/75.

2016年3月27日 · In fact, all codecs with the exception of G711a and G.711u are lossy, so transcoding is an all-round blight. The reason I'm all for an opus solution is because I've added a click to call button on my Web site which itself uses opus – perhaps in the long run customers will call my advertised landline did number less and click to call more ...