We need a sip client app for android/iOS that could connect to a sip server and could make/receive audio/video call for a door intercom.
It must have a simple interface for showering intercom video and buttons for answering/hanging/open door.
Must have a config tab for entering connection parameters to sip server.
Linux server app to store screenshots/videos of intercom when call is made
Mobile In-app option to see logs/screenshots/videos of calls