Answer or Open the Door From Any Phone
You get packages and you don't want them sitting on your doorstep. Or, you need to open the door for housecleaners and contractors when you're not at home. Forget the spare keys. Forget the dead bolt codes. These two products from Viking Electronics allow you to answer the door, speak with the visitor from any phone anywhere, and even open the door remotely.
Install the C-250 controller between the landline demarcation box and your home phones or between your router and your VoIP box. Connect the controller to the Viking E-40-BN-EWP door box. Then program the controller to dial up to five family cell phone numbers. When a visitor presses the button, the controller rings your home phone with a double ring so you know it's a visitor at the door and not a regular phone call. Answer the door and open the door from any home phone.
When you leave the house, simply program the controller to forward the door box calls to your cell phone. If you don't have land or VoIP service, leave the controller in call forwarding mode and it'll send all door box calls to a portable phone. The forwarded call will show up on your portable phone's screen as your front door. Answer the call and enter a code to activate your door strike or Wi-Fi–enabled dead bolt. The Viking units are a bit pricey, but they're commercial-grade products, so they'll last much longer than cheaper consumer-grade versions.