We have done the biggest VoIP project in free lancer including client and server modules.
Please refer to the following project , it will give to he desired trust in our capabilities of handling large scale VoIP projects:
https://www.freelancer.in/projects/1028843.html
Have experience in RTP, RTMP and other relevant protocols, have developed VOIP voice recording server and video streaming conference server.
Please get in touch to detail us on your specific requirement to start with.
We have and edge over just freelancers as we are an established VoIP venture.
Our support team is available 24/7 for assistance.
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Belint Group