Pls let me know the cheapest way to make an intercom to speak between 1st floor to 3rd floor without a phone line. Answered
I would like to make a home intercom to communicate with my brother who resides in the 1st floor & myself in the 3rd floor in the same apartment. It is costing us more to contact via our mobiles each & every time by our house members. So, I have 2 old telephones with me & want to know the method to connect the same to be used as an intercom.