[VoiceOps] Experiences with VoIP and 100+ seat sites

Tim Bray tim at kooky.org
Wed Feb 1 19:09:10 EST 2012

On 1 Feb 2012, at 17:33, Carlos Alvarez wrote:

> On Wed, Feb 1, 2012 at 10:08 AM, Tim Bray <tim at kooky.org> wrote:
> 9) Don't use low rate codecs.   711 all the way.  Or 722.
> I completely disagree.  Most of our customers are on g729 and nobody was able to hear the difference when we tested that versus 711.

I think it is a bit different in Europe.  People are used to really good phone lines which are always g711a all the way.  All trunks have been digital for 30 years or more.

People can't put their finger on the difference on 729, but they know it is there.  

In the UK many telemarketing calls are delivered from India to the UK using G.729 and G.723.  There is a badge on the call (the sound of background call centre noise encoded) which makes you think you are about to have your life wasted.

My belief is that g729 calls last longer than g711 calls.   I also believe that people ask for more clarifications.  They say 'Can you repeat that?', 'Can you spell that please?', 'Sorry I missed that.'  more often.

It would be an interesting thing to pull the data on or some some proper research.

In the early days of Skype I used to watch people come off a call and say 'That call was really hard work'.  I think Skype have improved their systems since though.

I'm just into things sounding good.  There was a time I could answer a call and tell you which VoIP provider the call came from.  Some had a distinctive sound.


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