*92: Activates the call forwarding no answer feature
From PhonePower Knowledge Base
*92 - Activates call forwarding no answer
This will activate the call forwarding on no answer from the phone. This will direct inbound calls that are not answered by the Phone Power phone to be directed to another phone number.
To use:
Pick up the Phone Power phone.
Once you hear the dial tone, dial *92 + the phone number you wish to have the calls forwarded to.
Example: