I need to find a user manual.
This phone requires a phone system. The system itself stores the information. You need a programming and installation manual for your phone system, not the phone. You will need to determine the model number of your main phone system and look for the manual using that information. Phones only have user guides that explain how to use the features and do not get into programming the system.
Also, if you lost your programing in a power outage, most likely the memory battery is dead and this will keep happening in the future. Before making any programming changes, that battery needs to be replaced or you could possibly get away with a UPS battery backup system to power the entire phone system in a power outage.
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