Aastra 6730i Administrator's Manual page 186

Network Settings
IP Phone UI
9. Press DONE to save the change and return to the Certificates screen.
Note:
This change is immediately applied after pressing DONE.
Enable/Disable HTTPS Validate Hostname
10. Select Check Hostnames.
11. Press Change to toggle the "Check Hostnames" field to "Yes" or "No".
12. Press DONE to save the change and return to the Certificates screen.
Note:
This change is immediately applied after pressing DONE.
13.
Press to exit the Options Menu and return to the idle screen.
For 6739i:
IP Phone UI
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.
For 6867i:
IP Phone UI
1.
Press on the phone to enter the Options List.
2. Press the Advanced softkey.
3. Enter the Administrator password using the keypad. Default is "22222".
4. Select Configuration Server.
5. In the Download Protocol field, select HTTPS.
Enable/Disable HTTPS Server Certificate Validation
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41-001343-02 REV05 – 07.2014