Indian OTP Number Server Development

I need a backend service that can automatically provision genuine Indian mobile numbers and make each number usable for one-time-password (OTP) verification. The numbers will serve a single purpose: user authentication on both my website and my mobile app.

Here is what I expect the finished solution to do:
• Securely allocate an available Indian number when my system calls your API.
• Receive the SMS OTP sent by third-party services and push the code back to my app/website in real time (webhook or polling endpoint).
• Release or recycle numbers according to configurable rules so we keep costs under control.
• Log every transaction for audit purposes while masking sensitive data.
• Deploy on a VPS or cloud instance that you help me set up, with clear documentation so I can scale or replicate the environment later.

Please build with whichever telecom/DLT gateway or virtual-number provider you recommend, as long as it reliably passes Indian OTP traffic and complies with local regulations. If you have a ready solution or past experience doing this in India, let’s talk about the best stack and a realistic timeline.