Advanced Call Center and SMS Platform

Project Requirement: Call Center Dialer + SMS Platform We are looking for an experienced development team/company to build a Call Center Dialer Platform with Web/Desktop + Mobile Applications, integrated with VoIP/SIP providers and SMS APIs. 1. Call Center Dialer Predictive Dialer Progressive Dialer Power Dialer Preview Dialer Click-to-Call Call queue management IVR integration Call recording Call transfer, hold & mute Call disposition / outcome management Agent status management Campaign management Call history and detailed CDR Real-time agent and campaign monitoring Supervisor dashboard Call analytics and reports 2. VoIP / SIP Integration The platform should support integration with multiple VoIP providers through: SIP SIP Trunk RTP WebRTC Provider APIs Direct Switch connectivity Features should include: Multiple VoIP provider connections Provider-wise routing Least Cost Routing (LCR) Failover routing DID management Caller ID management Concurrent call limits Real-time call status CDR synchronization Provider balance/usage monitoring 3. SMS Integration Build a complete SMS module supporting: One-to-one SMS Bulk SMS Promotional SMS Transactional SMS OTP SMS campaigns Scheduled SMS Contact/group management Sender ID management Delivery reports Failed-message reports SMS templates API-based SMS integration Multiple SMS gateway/provider connections 4. Mobile Application Android/iOS application for agents and users with: Login & authentication Agent dashboard Make/receive calls WebRTC/SIP calling Contact management Call history SMS sending/receiving Campaign access Agent status Notifications Call disposition Basic performance reports 5. Desktop Application Windows/macOS desktop application with: Agent login Softphone WebRTC/SIP integration Call controls Contact/campaign management SMS module Call history Notifications CRM integration Background call handling 6. Admin & Supervisor Panel Multi-tenant architecture Admin/sub-admin/user roles Agent management Team management Campaign management Number/DID management VoIP provider management SMS provider management Routing rules Wallet/billing system Usage monitoring Call & SMS reports Real-time dashboards Audit logs 7. API & Integrations The platform should be designed with APIs for: VoIP/SIP providers Direct Switch SMS gateways CRM systems WhatsApp/other messaging platforms where applicable Webhooks Third-party applications 8. Suggested Technology Backend: Node.js / NestJS Frontend: React.js / Next.js Mobile: Flutter or React Native Desktop: Electron Database: PostgreSQL + Redis Real-time: WebSocket Telephony: SIP / WebRTC / RTP Queue: Redis/RabbitMQ Infrastructure: Docker + Linux 9. Security & Scalability The system should support: JWT/OAuth authentication RBAC permissions API rate limiting Encryption Secure SIP/WebRTC configuration Fraud prevention controls Call/SMS usage limits Detailed audit logs Horizontal scaling High availability Monitoring and alerting 10. Expected Deliverables Complete source code Web admin panel Agent web application Desktop application Android application iOS application Backend/API Database architecture VoIP/SIP integration SMS integration API documentation Deployment documentation Production deployment Testing & bug fixing Looking for: Experienced developers/team with proven experience in VoIP, SIP, WebRTC, call-center dialers, bulk SMS, telecom APIs and scalable communication platforms. Please share your previous relevant projects, technical approach, estimated development timeline, team structure and commercial proposal.