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For my project, I used Flutter webRTC, sip, flutter incoming call kit, and FCM for incoming calls. But whenever the user exits the app with the back button, the SIP connection is terminated and my backend server can't know it is still alive.
Whenever incoming calls are there, Although FCM and Flutter incoming call kit can wake my app and open the app with sip registration at initialization, I cannot know the current SIP state of incoming calls. So, it makes the app open but nothing.
Are there any possible ways to keep SIP connection alive in background or terminated situation? I know there may be drawbacks such as devices battery draining or security issues. But it is okay for me if I can keep SIP state connection alive.
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