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Network Settings
41-001343-02 REV04 – 05.2014 4-25
SBC or ALG Proxy/Registrar
The phone at IP address 10.10.10.20 is configured to register with the proxy at 63.251.195.20. Because the proxy/registrar
has session border control (SBC) or application layer gateway (ALG) functionality, no additional IP phone configuration is
required.
Other Proxy/Registrars
The phone at IP address 10.10.10.30 is configured to register with the proxy at 63.251.195.30. Because this proxy/registrar
is not a Nortel proxy and has no SBC or ALG functionality, the configuration must additionally include the "sip nat ip" and
"sip nat port" settings that contain the public ip address of the NAT router and the port used for call signaling messages.
This information is embedded in protocol messages to allow the proxy/registrar to reach the IP phone on the NAT router
private network.
NAT Router Configuration
You must configure the NAT router to allow signaling or media packets containing the various UDP port values to flow
between the private and public networks that are separated by the NAT router. In the sample network, the NAT router
must not filter packets using ports 3000, 5060, 6060, 16420, and 16430.
Configuring NAT Address and Port (optional)
You can also configure a specific NAT address and port on the IP phone using the configuration files, IP Phone UI, or Aastra
Web UI.
Configuration Files
For specific parameters you can set in the configuration files, see Appendix A, the section, “Network Address Translation (NAT) Settings” on pageA-25.