AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN - Manual (Page 195)

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14 Press Done (4 times) to finish.
Note: The session prompts you to restart the IP phone to apply the configuration settings.
15 Select Restart.
For the 6739i:
Note: NAT is disabled by default. Use this procedure to enable NAT if required.
1 Press the Options key on the phone to enter the Options List.
2 Press Advanced. A keyboard displays.
3 Enter the Administrator password using the keyboard. Default is “22222”.
4 Press Network.
5 Press to scroll to the next screen.
6 Press the NAT Settings button.
7 Press Static NAT, enter a public IP address of your NAT device, in dotted-decimal format, in the text
box, and press
.
8 Press NAT SIP Port, and enter the public SIP signalling port number of your NAT device. Default is
51620.
9 Press NAT RTP Port, and enter the RTP Port number of your NAT device. Default is 51720.
10 Press until the Options List screen displays.
11 Press Restart to restart the phone for the change to take affect.
IP Phone UI
Step Action