Use of the following settings may solve the problem. I expect you already have most of these settings.
(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
(The NAT_Keep_Alive_Intvl value 179 was chosen to be less than the NAT session expiry time of most routers.)
(under Line_1 and Line_2 (or PSTN_Line) tabs)
NAT_Mapping_Enable: yes
NAT_Keep_Alive_Enable: yes
NAT_Keep_Alive_Msg: (this should be blank in order to send dummy packets)
NAT_Keep_Alive_Dest: $PROXY
Register Expires: 3600
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If you prefer not to use a STUN server then do the following:
1. Forward the SIP ports and the RTP port range.
2. Set STUN Enable: no
3. Set NAT_Keep_Alive_Enable: no
4. In order for the ATA/phone to know it's public IP address, make sure the ATA/phone is registered with at least one SIP registrar, or enter your public IP address into the appropriate setting in the ATA (in Linksys ATAs this setting is EXT_IP).
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Make sure that you have filled in 'Outbound Proxy:' the same as you have for 'Proxy:' including the proxy's port number. Also confirm that 'Use Outbound Proxy:' and 'Use OB Proxy In Dialog:' are both 'yes'.
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