<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I'm quite fond of GSM610 as a low(ish) bandwidth codec - although it isn't as good as (say) speex or Silk,<div>it is widely supported, and European users have had years of cellphone use to get used to the specific </div><div>sound of a GSM call. So you can often go from a GSM610 supporting handset all the way through to a </div><div>GSM supporting ITSP without needing to transcode at all.</div><div><br></div><div><div><div>If at all possible avoid creating a path which involves 2 different lossy codecs - e.g. 729 _and_ GSM </div><div>the results are significantly worse than either.</div><div><br></div><div>If you can control all of the call path and have devices that support it, Silk is _lovely_ . It takes a bit of tuning</div><div>for your expected network (which is unfortunately manual in Asterisk 10) but it is worth it.</div><div><br></div><div>Tim.</div><div><br></div><div>On 15 Apr 2012, at 12:15, Gustavo Garcia Bernardo wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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<div>Is it a good idea to use asterisk transcoding from G711 to iLBC or should I find out any other solution not involving transcoding (f.e. using G.729 that is supported in both sides). I'm worried about voice quality and trying to avoid paying for G.729
licensing.</div>
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<div>Anybody with experience or quantitative measurements of the voice quality degradation in that scenario?</div>
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<div>Regards,</div>
<div>G</div>
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