What I would really like is a push-to-talk app on my phone, so I can talk to my house from anywhere without worrying about putting a microphone in every room, o

What I would really like is a push-to-talk app on my phone, so I can talk to my house from anywhere without worrying about putting a microphone in every room, or monkeying about with wakeword detection. I'm sure it's doable, I'm just not conscious of having seen it done.