Based on the results of my packet tracing tests done last year I can add a few details to the excellent information provided by carlosalbffgomes.
Quote:
Originally Posted by richard
So in the case of Voxalot, does it act only to initiate the multimedia session and and does no proxying?
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Even when 'Optimize Audio Path' is set to Yes, Voxalot will still proxy the RTP (voice) packets if it detects some kind of misconfiguration in the NAT settings of the party receiving the call, and possibly also the party making the call. This can result in unwanted, unexpected proxying.
Quote:
Originally Posted by richard
What happens when calls are passed through another provider via Voxalot, such is Betamax. Do they proxy? Are there certain conditions when Voxalot will proxy and time when they wouldn't? Same question for the Betamax end.
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Betamax will proxy all RTP packets for all calls and will not change RTP packet connection IP address after the call has been initiated. When placing a Betamax call through Voxalot this results in RTP packets making a big triangle path, with one side direct from the Betamax proxy (in The Netherlands) and the other side is a two-leg hop to The Netherlands via Voxalot's proxy.