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Upgrade Guide > Upgrade Instructions > F. ICE OS Configuration Wizard > Telephony
Telephony
1. Verify the configurations on the screen are correct, then select Apply to proceed.
2. GEOREDUNDANCY: 
Perform the same steps for the DC1 and then DC2 screens.
3. For DC2 only, perform the following:
*Install Telephony Server (DC2):
If you are using telephony, ensure this option is enabled on the DC2 server.Support for this feature has been added in 3.6.0