Custom Power Dialer Integration Build

I need a true power dialer developed from the ground up and wired directly into my proprietary CRM. The system must let reps click once to launch calls, work through a queue automatically at a fixed cadence, and post every outcome back to the CRM in real time—contact details, call recordings, notes, and disposition codes included.

My CRM already exposes a REST-style API for contacts, activities, and authentication, so the dialer should authenticate with OAuth2, pull call lists by campaign, and push results back without manual export/import. A clean web dashboard (React or similar) is preferred for agents and supervisors, with live metrics such as calls per hour, average talk time, and wrap-up codes.

Core requirements
• Simultaneous line management suitable for a power dialer flow (not predictive)
• SIP or WebRTC calling engine with call recording, pause/resume, and DTMF support
• Automatic call logging and status syncing to my custom CRM endpoints
• Role-based access (admin, supervisor, agent)
• Resilient queue handling so an agent never waits for the next number
• Detailed reporting downloadable as CSV or accessible via API

Deliverables
1. Complete source code with build instructions
2. Dockerised deployment or clear server setup steps
3. API documentation covering every integration touchpoint
4. Short video or live demo proving the dialer running against a test CRM instance
5. Post-delivery support window to fix integration bugs

I need details on the software/platform that will be used, along with the estimated cost to build this.
This does not need to be fancy, but it should be highly functional at its core.

i need your effort estimation and cost for the project.