PSAPLink — Public Safety Alert Network

PSAPLink is a multi-tenant public safety notification platform that connects PSAPs (911/dispatch centers) with their third-party response companies through a real-time, multi-channel alert pipeline. When a dispatcher creates an incident, companies are notified across 11 transport channels, per-user acknowledgements are tracked, and the system automatically escalates when responses are not received on time.

Two Applications

PSAPLink Cloud (cloud/)

The cloud-hosted hub. Handles hub routing, company dashboards, and the superadmin console.

• Receives signed incident events from PSAPLink PSAP instances and routes notifications to company users
• Fans out alerts across 11 transport channels (email, SMS, Slack, Teams, PagerDuty, Discord, CAP, SNPP, ntfy, push, webhook)
• Tracks per-user acknowledgements; routes ACK confirmations back to the originating PSAPLink PSAP instance
• Hosts company dashboards where users manage transport preferences, ACK alerts, and send replies
• Provides a superadmin console for managing all PSAPs, companies, and platform configuration
• Logs every communication event in an append-only audit record

PSAPLink PSAP (psap/)

The lightweight agent installed on each PSAP's isolated network.

• Polls CAD export files (CFS polling) using vendor-specific parsers
• Provides a dispatch interface for PSAP telecommunicators to create and send incidents
• Signs and pushes incident events outbound to PSAPLink Cloud — no inbound connections required
• Receives company ACK confirmations back from Cloud (callback or poll mode)

System Architecture

[PSAP Network]                         [Cloud Infrastructure]

  CAD System (TriTech, CentralSquare,
              NewWorld Aegis, etc.)
      |
      | XML export files
      v
  PSAPLink PSAP
  (behind PSAP firewall)
      |
      | signed HMAC event (HTTPS)
      |  POST /api/v1/core/events/incident
      v
                               PSAPLink Cloud
                               (hub routing)
                                   |
                          NotificationService
                                   |
                     +-------------+-------------+
                     |             |             |
                   email          SMS         Slack ...
                     |             |             |
                  Company users notified via 11 transport channels
                                   |
                          Company users ACK
                          (web dashboard or transport reply)
                                   |
                               AckIngestionService
                                   |
      | ACK routed back           |
      |<--------------------------+
      |
  PSAPLink PSAP
  Dispatcher sees ACK confirmation

Tech Stack

Layer	Technology
Backend	PHP 8.2+ / Symfony 7.x
Frontend	React 18
Database	PostgreSQL 15+
Async Queue	Symfony Messenger
Real-time	Mercure SSE
Encryption	libsodium (XSalsa20-Poly1305)
Auth	JWT (15-min) + API keys
Containers	Docker Compose