[Flutter] Flutter receive web rtc calls when app is terminated (detached state)

Websocket connection is closed abruptly in asterisk using Web RTC connection when my flutter app terminated (User swipe to close app)

Flutter version

Flutter 3.24.0 • channel stable • https://github.com/flutter/flutter.git Framework • revision 80c2e84975 (3 months ago) • 2024-07-30 23:06:49 +0700 Engine • revision b8800d88be Tools • Dart 3.5.0 • DevTools 2.37.2

Flutter library used

sip_ua: https://pub.dev/packages/sip_ua

Asterisk version

Asterisk 20.4.0

I tried using flutter background service to open the connection as soon as the connection is closed:

@pragma('vm:entry-point')
static void onStart(ServiceInstance service) async {
print("call background serivce is starting");
SipUAListenerBackground newListener = SipUAListenerBackground();
SipHelperManager().getHelper().addSipUaHelperListener(newListener);
}


and for my SipUAListenerBackground:

class SipUAListenerBackground implements SipUaHelperListener {

@override
void transportStateChanged(TransportState state) {
// If state is closed
// ...
UaSettings settings = UaSettings()
..webSocketUrl = savedLoginInfo['websocketUrl']
..uri = 'sip:${savedLoginInfo['username']}@${savedLoginInfo['server']}'
..authorizationUser = savedLoginInfo['authorizationUser']
..password = savedLoginInfo['password']
..displayName = savedLoginInfo['displayName']
..userAgent = 'Flutter SIP Client'
..dtmfMode = DtmfMode.RFC2833;

await _sipHelper!.start(settings);
}
}

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