Aastra SIP 53I Administrator's Manual page 146

IP Phone Administrator Guide
Network Settings
.
Aastra Web UI
Step Action
1 Click on Advanced Settings->Network->Advanced Network Settings.
2 Enter a NAT IP address in the "NAT IP" field. The value must be entered in dotted decimal format.
For example, 0.0.0.0. The "NAT IP" is the public IP address of your NAT device.
3 Enter a NAT port in the "NAT SIP Port" field. Default is 51620.
The "NAT SIP Port" is the public SIP signalling port number of your NAT device.
4 Enter a NAT port in the "NAT RTP Port" field. Default is 51720.
The "NAT RTP Port" is the RTP Port number of your NAT device.
5 Click
4-22
to save your settings.
41-001160-00, Release 2.1, Rev 04