Can the fire telephone line and the hand alarm telephone line be connected in series in the fire alarm system?

The telephone line on the handheld newspaper belongs to the telephone jack, and the extension is fixed.

Which brand of telephone system are you talking about? For example, Gulf's telephone system cannot be wired directly. Each fixed telephone extension in Gulf requires a telephone module; the telephone plug on the handheld telephone is The hole can be connected to the telephone module, but it cannot be connected to the fixed telephone.

First of all, according to your description, you should be using a bus-type telephone. It is best to provide specific brand and model numbers.