I need professional mobile had experienced working with OTT APP (have features call look like messenger/Viber/Whatapp) , can make call and wakeup call anytime when receive push notification of server.
We use SIP Server ( Freeswitch) to develop system.
Each time have call from user A -> user B, system will push notification to user B
User B install mobile app ( Android/IOS) and wakeup and receive call.
We can make this flow work with some device but not all device work smooth, some device can not wakeup ( android, ios too)
i think the app like that ( voip ) need some special skill and tech to implement.
My requirement: please see the attact file
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Dear Hiring Manager, I have read all your requirements and what you want to do that you have given the attachment have seen it all . Let's discuss it on chat more about the project .