One-way-audio
Usually, one-way-audio is due to NAT problems. The reason is that your VSP doesn't know your public IP address so it can not establish a correct path to the RTP packets in both directions. There are several reasons for this kind of problem, but you can try do the following to solve it:
1 - Configure properly a STUN Server in your device;
2 - Configure port forward in your router (5060 to SIP and something else to RTP packets). In this case you don't need a STUN server, but you can also use it;
3 - Use Symmetric NAT in Voxalot account. This option introduces some delay in the voice packets but usually not noticeable. I should say that I'm using Symmetric NAT in a transatlantic scenario and the delay introduced by such configuration is almost unnoticeable.
Regards,
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