[Asterisk-Users] call "load balancing"

[Jean-Michel Hiver]

Darren Wright wrote:

>---------------------------
>An ever better way is get some kind of SLA with guaranteed uptime and 
>bandwith, a symetrical link, and do some traffic shaping to ensure that 
>VoIP has priority. Part of the point of VoIP is to save money by 
>collapsing voice and data networks onto one (presumably robust) network,
>
>so having 2 shabby separate DSL connections kinds of defeats the
>purpose.
>------------------------------
>
>
>How do you traffic shape incoming packets though????  Without your ISP
>to provide QoS for downstream voice traffic, quality can still be an
>issue...
>  
>
Well, freebsd's "dummynet" sort of does it. There is also a product 
called "netequalizer" (based on BSD) which seems to do this as well.

Second, usually the more bandwith you have, the less you need to shape 
traffic.

Third, usually, doing outgoing shaping and preventing your DSL modem 
from buiding queues with your upstream traffic improves VoIP 
tremendously, regardless of inbound traffic shaping.

And then, it would be wise to limit TCP traffic to 60-70% of available 
bandwith. Since UDP / RTP is usually prioritary over TCP, it means you 
don't really have to worry about inbound shaping, unless:

1) your provider is voluntarily screwing up VoIP traffic
2) some idiot purposingly fills up your pipe with UDP traffic

Cheers,
Jean-Michel.