Hi, thank you for your reply.
I have a client who has an intercom but not an indoor station. He is using it through SIP with a soft client in his phone. However lately he has been experiencing some issues. So I though about analyzing the "native" solution from Hikvision (the APK), but I can't find it anywhere. Do you still have it?
So your app works like the built in solution from Hikvision in the indoor stations?
Thank you very much for your answer.