I have a customer that wants to add a DOC to his system and where his phone will be going will be in an inside hallway with cameras. My question is can I use a T7316 or an ata with a single line phone set up connected with the DOC or do I have to use the Doorphone box? I see why the doorbox is used externally on a building but can you use another phone inside and out of the weather? Thank You for any input
Mike
Mike