Setting up a PBX for Israel<->US communication
Gilad Ben-Yossef
gilad at codefidence.com
Wed Feb 11 13:41:41 IST 2009
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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Gilad Ben-Yossef
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