Build white-label iOS Android SIP softphone apps
Implement background calling, push notifications (APNs + FCM)
Integrate fluttercallkitincoming for native call UI on both platforms
Work on codec negotiation, DTMF, and call transfer features
Flutter Dart dart-sip-ua iOS Android FCM/APNs
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📌 Flutter Mobile Developer Gujarat
🏢 CelloIP Technologies
📍 Gujarat
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