Setup VoIP server with CSipSimple mobile app

Hello, I'm a senior developer. I'm familiar with SIP, Freeswitch, asterisk..., I familiar with android too. I can finish your project

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9 years of experience in server management and configuration 9 years of experience in server management and configuration 9 years of experience in server management and configuration

I have configured Freeswitch with CSipSimple mobile app . I know about Pin to Pin call via FreeSwitch . It will also support voicemail ,routing,billing as well as push notification and it will work as webrtc gateway on different port . For transport settings we can enable UDP,TCP,TLS in freeSwitch if UDP is blocked in Some Corporate network.