Need professional VOIP OTT App -- 2

Hi Friends,

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

Skills: Mobile App Development, Android, Asterisk PBX, VoIP, iOS Development

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About the Employer:
( 3 reviews ) Ho Chi Minh, Vietnam

Project ID: #29472461

16 freelancers are bidding on average $6271 for this job

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