By capturing SIP packets I can see that Voxalot first establishes the audio path (RTP packets) through their servers (following SIP protocol Voxalot sends the voice session description details inside a SIP/SDP packet during initial SIP negotiation). A few seconds later if certain conditions are met (including "optimize audio path" set yes in your account) Voxalot will attempt to reroute the audio path directly from one endpoint to the other. This is where things go wrong, apparently Betamax servers accept only the first Session Description and therefore continue to send voice packets through Voxalot instead of directly to your IP phone.
Last edited by boatman; 07-21-2009 at 05:35 PM.
Reason: clarity
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