click to call VoIP System Integration into Django CRM

I am looking for an experienced VoIP/PBX developer to create a complete VoIP calling system from scratch and integrate it into my existing Django-based CRM. The goal is to enable users to make and receive calls directly from the CRM interface using a secure and reliable VoIP solution.
Requirements:
Setup of VoIP or PBX system (Asterisk, FreePBX, or any suitable open-source solution)

SIP trunk configuration for call routing

WebRTC or softphone integration for browser-based calling

Call functionalities: outbound & inbound calling, call logs, call recordings, status tracking

Route incoming calls to CRM as well as to a physical phone number (e.g., mobile or landline)

User authentication and role-based access control for call features

API endpoints to interact with Django backend (or direct integration)

Basic dashboard/reporting for call activities

Documentation for system setup and deployment


Preferred Tech Stack:
Asterisk / FreePBX / FusionPBX / FreeSWITCH (open to recommendations)

WebRTC / SIP.js or similar for browser calling


Additional Notes:
Should be scalable and secure

Clean and maintainable code

Deployment on my VPS or cloud server

Open to suggestions and best practices from the developer