Bought a house with wired doorbell

Before I order the special tool to open up the doorbell - is there any way to just "scan" and find it to add to a system or force it to trigger an indoor ringer? All I'm trying to do is get the bell to ring inside the house. Don't care about video or subscriptions. There's a little hockey puck thing plugged into one of the outlets inside the housethat seems to be an indoor ringer.