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North American Network Operators Group

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RE: VoIP QOS best practices

  • From: Ray Burkholder
  • Date: Mon Feb 10 14:19:23 2003

Depends upon the codec you are using.  G.711 uses about 80 kbps in each
direction, g.729 takes about 16 to 24 kpbs in each direction.  So it is
easy to do the math on how much capacity you need, and what your
bandwidth budget is when you factor in traffic from other services.  If
you operate in a cisco world, they have info on their site for traffic
engineering your outbound traffic.  And if you have good relationship
with your upstream provider, they could use the same rules to ensure
traffic is regulated into your pipe.

Ray Burkholder


> -----Original Message-----
> From: Charles Youse [mailto:cyouse@register.com] 
> Sent: February 10, 2003 14:22
> To: Bill Woodcock
> Cc: nanog@nanog.org
> Subject: RE: VoIP QOS best practices
> 
> 
> 
> But I could conceivably have 10+ voice channels over a T-1, I 
> still don't quite understand how, without prioritizing voice 
> traffic, the quality won't degrade...
> 
> C.
> 
> -----Original Message-----
> From: Bill Woodcock [mailto:woody@pch.net]
> Sent: Monday, February 10, 2003 1:20 PM
> To: Charles Youse
> Cc: nanog@nanog.org
> Subject: RE: VoIP QOS best practices
> 
> 
>     > My main concern is that some of the sites that will be tied with
>     > VoIP have only T-1 data connectivity, and I don't want 
> a surge in
>     > traffic to degrade the voice quality, or cause disconnections or
>     > what-have-you.  People are more accustomed to data 
> networks going
>     > down; voice networks going down will make people shout.
> 
> It works fine on 64k connections, okay on many 9600bps 
> connections.  T1 is
> way more than is necessary.
> 
>                                 -Bill
> 
> 
> 




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