I have used the AtHome App.
https://itunes.apple.com/ca/app/atho...305567000?mt=8
The dummy phone needs the AtHome Streamer app.
https://itunes.apple.com/ca/app/atho...590416158?mt=8
I used it when I was traveling and had my dog in the hotel room. Connected the dummy phone to the hotel wifi. I like that it has a function where you can push audio back, so when my dog was showing signs of stress I could talk to him and calm him down.