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E.164 Phone Numbers: Store phone numbers with country code (+39...) to dial properly through Asterisk ARI and send SMS.
On-Call Availability: Define start/end schedule intervals. Active contacts in the current window are selected automatically.
Escalation Priority: Priority 0 is Primary Responder, 1 is Secondary, 2-3 Backup, 4 Duty Supervisor.
CSV Operations: Import or export entire contact databases at any time.
Neural TTS Engine: Message text is automatically synthesized into clear 8kHz/16kHz audio using Silero Neural TTS.
Audio Caching: Synthesized audio is cached locally by message hash for instant zero-latency playback.
Smart Recipient Picker: Choose a specific contact or select "Use current On-call" to resolve on-duty responders.
Asterisk ARI Integration: Channels are initiated via Asterisk REST Interface and placed in Stasis bridge.
DTMF 4 Acknowledgment: The recipient presses 4 to acknowledge the alert, marking it acknowledged and terminating retries.
Automatic Retries: Unanswered calls automatically retry according to retry count and backoff configuration.
On-Premise Hardware Modems: SMS is dispatched directly via serial AT commands (/dev/ttyUSB) without external dependencies.
Carrier Failover: If GSM signal is lost or modem fails, failover to secondary gateway (e.g. Twilio) triggers automatically.
Full Delivery Tracking: View outbound SMS logs, delivery statuses, carrier metadata, and timestamps in real time.
WebSocket Event Feed: Real-time feed of Asterisk ARI events including StasisStart, ChannelDtmfReceived, and ChannelDestroyed.
Troubleshooting Audits: Use the event timeline to diagnose call setup delays, SIP trunk responses, and DTMF tones.
Alertmanager Receiver: Configure Alertmanager to forward firing alerts to the webhook service:
Incoming alerts automatically resolve duty on-call contacts, synthesize speech, and initiate emergency phone calls.
Send a live test call or SMS from the diagnostics console.