Aastra Telecom SIP 57I - Manual (Page 144)

Network Settings
4-20 41-001160-00, Release 2.1, Rev 04
IP Phone Administrator Guide
Configuring the IP Phones
.
Aastra Web UI
Step Action
1 Click on Advanced Settings->Network->Advanced Network Settings.
2 Select Yes (enable) or No (disable) in the "Nortel NAT Traversal Enabled" field to enable or disable
NAT for a Nortel network.
3 Enter a time, in seconds, in the "Nortel NAT timer" field. Valid values are 0 to 2147483647.
Default is 60.
4 Click to save your settings.