Hi Vapi Support Team, We’re currently building a Voice AI agent using your API under the Bid2Bill project, and we’ve encountered a few challenges that we need help resolving: We’re unable to make sequential or simultaneous bulk calls (e.g., 200–2000 calls) through the Vapi API. We’d appreciate your guidance or an optimized approach to handle large-scale call execution efficiently. Some API requests show a “processed” status, but no calls are actually made. Could you please help us investigate and resolve this issue? We also require Indian local voices to ensure natural interactions with our customers. Please let us know if you can enable or suggest suitable voice options. Our account is registered under the email: madhu.rajan@transcpginc.com We would greatly appreciate your assistance in resolving these issues at the earliest. Best regards, Bid2Bill Team

To efficiently handle bulk calls (200–2000) with Vapi, use the Outbound Campaigns feature, which automatically manages concurrency and queues calls as slots become available. For example, you can initiate a batch call with:

json
{
  "assistantId": "your-assistant-id",
  "phoneNumberId": "your-phone-number-id",
  "customers": [
    { "number": "+911234567890" },
    { "number": "+919876543210" }
    // ...more numbers
  ]
}

Check your concurrency limit in the Vapi Dashboard and consider increasing it if needed for higher throughput. This approach ensures all calls are processed efficiently, even at scale. Sources: - [Outbound Campaigns Overview](https://docs.vapi.ai/outbound-campaigns/overview) - [API Reference: Create Phone Call](https://docs.vapi.ai/api-reference/calls/create-phone-call)

@Ravi Teja Reddy Please DM me, we have multiple customers in India, connected to VAPI and other AI platforms.