[Asterisk-Users] What is acceptable network latencyforvoipconnection?

[Robert Augustyn]

Damon,
Thanks that is great info.
robert



--- Damon Estep <damon at suburbanbroadband.net> wrote:

> > Thanks,
> > So what are the fresholds of the jitter, delay,
> and
> > packet loss I should be asking my ISP for?
> > robert
> > 
> 
> On a T1 you should expect an SLA that states;
> 
> Latency - < 80ms round trip latency between your end
> and the ISP core
> routers within a few thousand miles, SLAs typically
> only cover traffic
> on the ISPS network. Try to use the same ISP for all
> VoIP endpoints so
> there is never any question about which network the
> delay occurs on.
> 
> Jitter - SLA should be < 5ms
> 
> Packet loss - should be < 0.5%
> 
> While VoIP might tolerate more jitter and packet
> loss than stated above,
> these are not unreasonable parameters for T1 service
> and you should be
> able to get an SLA that falls in or near these
> parameters. Any ISP that
> can not provide a close SLA is not confident in
> their network.
> 
> In my experience, packet loss is the biggest enemy,
> jitter is a close
> second, and latency is third (if it is still under
> ~200ms).
> 
> Latency is a function of bandwidth and without
> congestion will be very
> consistent on similar bandwidth connections.
> Increases in latency due to
> congestion almost always come with high packet loss
> and jitter.
> 
> 
> Google for T1 Internet SLA and you will see many
> sample SLAs.
> 
>