Aastra 9000i Series Administrator's Manual page 194

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,
Address Translation (NAT) Settings"
IP Phone UI
Step Action
1 Press on the phone to enter the Options List.
2 Select Administrator Menu.
3 Enter your Administrator password.
Note: The IP Phones accept numeric passwords only.
4 Select Network Settings.
5 Select Static NAT.
6 Select NAT IP.
7 Enter a public IP address of your NAT device in dotted-decimal format.
8 Press Done to save the setting.
9 Select NAT SIP Port. Default is 51620.
10 Enter the public SIP signalling port number of your NAT device.
11 Press Done to save the setting.
12 Select NAT RTP Port.
13 Enter the RTP Port number of your NAT device. Default is 51720.
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