Please contact to any SIP based IP-Telephony service provider in order to get the following SIP settings:
 
1. Login Id or User name. 3. SIP Proxy/Gatekeeper IP or FQDN.
2. Login password. 4. SIP outbound Proxy IP or FQDN. 5. Display Name
Note: Leave Display Name and/or SIP outbound Proxy blank if your ITSP (IP-Telephony service provider) does not provide these settings.
If user is behind the NAT/firewall/router then these problems can occur:
           - Unable to register to the proxy server.
           - Call is connected successfully, but unable to listen the other end.
 
To resolve these issues, ITSP (IP-Telephony service provider) support SIP OUTBOUND PROXY. Outbound proxy is the only way to let the NAT/firewall user make and receive phone calls.
If the NAT/firewall router does not support SIP pass-through, you need to consult your ITSP if they support SIP outbound proxy. Since different NAT router vendor implement NAT differently.
Typically ITSP may provide SIP outbound proxy to resolve NAT pass-through issues.
 
Email: support@vaxvoip.com
Web: http://www.vaxvoip.com