Depending on which Wiki settings you used your ATA's NAT settings may need to be changed. Set the following:
set the following:
(under SIP tab)
Handle_VIA_received: yes
Handle_VIA_rport: yes
Insert_VIA_received: yes
Insert_VIA_rport: yes
Substitute_VIA_Addr: yes
Send_Resp_To_Src_Port: yes
STUN_Enable: yes
STUN_Test_Enable: yes
STUN_Server: stun.voxalot.com:3478 (or any STUN server such as 'stun01.sipphone.com:3478' or 'stun.sipgate.net:10000')
NAT_Keep_Alive_Intvl: 179
(under Line_1 and Line_2 (or PSTN_Line) tabs)
NAT_Mapping_Enable: yes
NAT_Keep_Alive_Enable: yes
NAT_Keep_Alive_Msg: (this setting should be blank)
NAT_Keep_Alive_Dest: $PROXY
Register Expires: 3600
In your Voxalot account set 'Symmetric NAT Handling' = Yes. This will have an effect only if Voxalot sees that your ATA has disabled NAT mapping. Your ATA will disable NAT mapping only when STUN_Test_Enable = yes and the ATA is behind a behind a symmetric NAT router. I hope this combination of settings will give optimum performance in any environment.
Sometimes SPI or other security features in the router must be disabled in order for SIP packets to pass. Experiment with disabling router security settings only if necessary.
Over at voip.ms you should probably set NAT = no. Regarding 'Device type' Voxalot is a 'IP PBX Server or Softswitch'. I don't know if that setting matters, you can experiment with it. Unfortunately voip.ms doesn't say what changes they make in response to the various settings they offer.
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