There are a lot of conditions, but first you have to have an analog port to back up the digital. In a TDA 30/50 it means one of the first 4 extensons in the system which have the Digital Super Hybrid ports. It's something that the dealer or someone with the dealer password and maintenance tool will have to set up. Once it's done, the mated extension can either stand alone, or be merged with the digital phone.
Carl
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