Setting up a PBX for Israel<->US communication

[Gilad Ben-Yossef]

Gilad Ben-Yossef wrote:

>> Is 200ms ping time too much for SIP, or is it irrelevant.
>>   
> Very relevant. Callers usually notice roundtrip voice delays of 250ms 
> or more.The recommendation for VoIP is a one way delay of less then 
> 150ms. Anything more will become very noticeable in conversation and 
> in real life 150ms is too high as well since jitter before induce 
> around 10ms addtional latency.
>
> In your case, 200ms round trip time, assuming a symmetric 
> distribution, of delay (but mind you that the internet isn't really 
> symmetrical...) is 100ms one way delay so this is not excellent but 
> not really bad either. In theory, at least, you shouldn't be able to 
> notice this delay in conversation.
>
Forgot to add - here is a great resournce for all things VoIP & QoS: 
http://www.voip-info.org/wiki-QoS

Gilad



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