Aastra Telecom Pro 160 - Manual (Page 218)

Manually Configuring Port-Forwarding
C-8 41-001134-05, Rev 00, Rel. 1.1
AastraLink Pro 160 IP Phone User Guide
Step Action
2 Specify the public IP address, or dynamic/static DNS FQDN of your router, then press <Done>.
For example: 65.96.171.130.
3 Specify the public SIP port (default 51620) for your router, then press <Done>.
Enter NAT IP:
65.96.171.130
Backspace
Dot .
ABC Done
Cancel
Enter NAT SIP Port:
51620
Backspace
Done
Cancel