Quote:
Originally Posted by mohnashaat
i have also an spa3102, but i do not use STUN server or enable NAT, when r they necessary? what r they for (in few words)
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If your ATA is behind a NAT router and you want to have low voice latency by using the shortest path for voice packets to/from the remote party, then you must use your public IP address and public RTP port number as the RTP Connection Address inside SIP/SDP packets. If such details are not used then the voice packets will be routed through Voxalot, not directly between you and the remote party. In order for your ATA to know it's public IP address and public SIP and RTP port numbers you need to use STUN, or forward the ports so that the public port numbers are the same as the LAN port numbers. In order for the ATA to actually use the details learned through STUN or other method, you must use "NAT Mapping Enable" as well as a few other settings.