For using ip camera you need to use app on your phone. When you setup camera you connect to it on your phone. But if you need to give somebody access to this camera, can you import settings from already connected phone and send them to other peson (in other city), so he can connect to this camera.
Or maybe I can connect using ip address? But how I can get it?
Probably it depends on the type of camera, what about EZVIZ C6CN 1080p Indoor Pan/Tilt Wi-Fi Security Camera