I find with Sipura/Linksys ATAs it's best to:
1. Set a STUN server and set 'STUN Enable' to Yes and set 'STUN Test Enable' to Yes.
2. Set 'Substitute VIA Addr' to Yes.
3. Set 'NAT Mapping Enable' to Yes.
4. Set 'NAT Keep Alive Enable' to Yes.
5. Forward ports 5060-506x to your ATA (x = highest SIP port used by your ATA).
6. Forward ports 16384-16482 to your ATA (these are the RTP ports used on a PAP2).
To receive incoming calls from a provider, you need to:
1. Have the provider forward incoming calls to 'sip:xxxxxx@voxalot.com.au' (xxxxxx is your VoXaLot number).
or
2. Have a SIP registration established between VoXaLot and the provider using the VoXaLot Provider page.
Ron
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