[Asterisk-biz] VoIP over satellite

Kevin P. Fleming kpfleming at starnetworks.us
Mon Nov 22 19:01:13 MST 2004

Eric Hall wrote:
> That 1 second each direction you talk about. Is that to start that call?
> I would say 1 second delay is not usable for most.

Actually, the raw speed-of-light delay is about .6 second round-trip. 
The remaining latency is due to equipment, packet formatting and 
deformatting, etc.

To directly answer your question: no, it's not to start the call, it's 
always. Every single packet from one end to the other takes around half 
a second to make the trip, plus network latency on the ground (on both 
ends). It would not at all be surprising to experience a total 
round-trip delay of 2 seconds.

People who are using this sort of connection understand about the delay, 
because it's present with all satellite based phone service.

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