[VoiceOps] G.729 A/B Experiences

Alex Balashov abalashov at evaristesys.com
Fri Mar 11 18:54:46 EST 2016

‎Yeah, touché. I just meant that for 8 Kbps that's pretty good. That doesn't mean it's a worthwhile call experience.

Alex Balashov | Principal | Evariste Systems LLC
1447 Peachtree Street NE, Suite 700
Atlanta, GA 30309
United States

Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

Sent from my BlackBerry.
  Original Message  
From: Paul Timmins
Sent: Friday, March 11, 2016 19:05
To: voiceops at voiceops.org
Subject: Re: [VoiceOps] G.729 A/B Experiences

If you like the way cellphones sound, you'll love G.729. I'll leave it 
at that.

On 03/11/2016 06:50 PM, Alex Balashov wrote:
> ‎As far as I can tell, G.729 is still the best intersection of low bandwidth and call quality, although the OPUS fans have their own opinion. It certainly leads to intelligible speech, though it can make for some amusing gibberish when applied to hold music, given the extreme code word contractions it uses to achieve its vicious compression ratio.
> However, it's relatively CPU intensive and frequently requires transcoding from G.711 PSTN table stakes. Moreover, in general things are going in the other direction, e.g. higher bandwidth ‎HD codecs.
> This leads me to ask: why, as a North American operator, would you want to do this today, in light of the capacity and price of available bandwidth today? Generally speaking, G.729 is something like a niche interest for international haulers and folk operating in developing world markets where bandwidth remains stubbornly expensive.
> --
> Alex Balashov | Principal | Evariste Systems LLC
> 1447 Peachtree Street NE, Suite 700
> Atlanta, GA 30309
> United States
> Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
> Sent from my BlackBerry.
> Original Message
> From: Robert Johnson
> Sent: Friday, March 11, 2016 18:56
> To: voiceops at voiceops.org
> Subject: [VoiceOps] G.729 A/B Experiences
> Hey everyone,
> I'm looking to deploy a lower-bandwidth codec, and am wondering what
> everyone's experience has been with G.729, primary regarding voice
> quality. Historically, we have limited our codec use to G.711.
> Some test calls in the lab are showing promising results, I'm just
> curious what might happen in the real-world.
> Thank you for your time!!

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