VOICE API
Build call tracking, AI Voice Agents, number masking, IVR, and conversation intelligence on a single API. Backed by carrier-grade SLAs in 220+ countries — because we are the carrier in those countries.
Gross margin on Voice API workloads. The economics of owned infrastructure.
Countries covered with our own carrier interconnects.
Average tenure of our top 5 Voice API marketplace customers.
Twilio, Vonage, Plivo, and Sinch resell capacity from carriers like us. CALLR is the carrier — registered in France, with direct fiber interconnects and our own E.164 number ranges. That changes what we can promise on latency, on routing, on cost, and on what stays in Europe.
Number masking for buyer-seller privacy. Per-listing call attribution for advertiser ROI. Real-time webhooks into your CRM. Built into the API from day one because that’s what marketplaces actually need — not bolted on as a generic CPaaS feature.
Voice AI is only as reliable as the network underneath. Connect OpenAI Realtime, ElevenLabs, or Vapi over SIP — or use our own Voice Agents. Either way, the call lands on infrastructure we control end-to-end.
Connect buyer and seller without exposing real numbers. Privacy by design.
Per-listing, per-advertiser, per-campaign attribution. Prove ROI to your buyers.
Deploy a fully-functioning agent in one line of YAML. Bring your model or use ours.
Visual flow builder, full programmability via REST API and Callr Actions.
Real-time and batch. EU-resident. Searchable.
Intent, sentiment, qualification, structured lead extraction. On every call.
Mobile and landline. 220+ countries. From a single API.
Salesforce, HubSpot, custom. Every call event in real time.
Built into the largest marketplaces in Europe.
BUILT API-FIRST
Same Voice API. Native SIP connections to OpenAI Realtime, ElevenLabs, and Vapi. MCP server included — Claude, Cursor, and other AI tools can manage your call flows directly.
voicebot.yaml
30-day attribution audit. We instrument 10 listings. You see what every inbound call is worth. No commitment.