Hi Advdamen,
Sure, we can help! You can run your own callback server with ngrok.
We have an explanation on the community site here of what a callback is and does:
https://community.sinch.com/t5/Voice-API/What-is-a-callback-in-the-Sinch-Voice-world/ta-p/10250
We have a github repo with code so you can run your own ngrok callback application server:
https://github.com/sinch/voice-api-webhook-nodejs
Its in javascript using node, so you can be up and running in no time!
Regards
Roland-Ian
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