AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN - Manual (Page 211)

4-48 41-001343-01 Rev 03, Release 3.2.2
For 6739i:
Aastra IP Phone UI
Step Action
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 Cfg. Svr..
5 Press HTTPS.
Enable/Disable HTTPS Server Certificate Validation
6 Press Cert. Validation, and select Enable.
7 Press to scroll to the next screen.
Enable/Disable HTTPS Validate Certificate Expiration
8 Press Check Expires, and select Enable.
Enable/Disable HTTPS Validate Hostname
9 Press Check Hostnames, and select Enable.
10 Press until the Options List screen displays.
11 Press Restart to restart the phone for the change to take affect.