### Answer Retell AI supports parallel outbound calls — the system does not queue leads. When a second lead submits a form while another call is active, you can initiate a new outbound call immediately. [(1) ]() Here's how it works: - Elastic capacity, instantly — AI voice agents scale on demand with zero lead time. - Retell supports massive scalability, allowing businesses to handle thousands of simultaneous calls without capacity limits. - The platform offers batch calling capabilities for automating thousands of outreach calls. The key constraint is your *CPS (Calls Per Second) * limit, which controls how many outbound calls you can initiate per second: [(2) ]() | Provider | Default CPS | Maximum CPS | |----------|-------------|-------------| | Twilio | 1 | 5 | | Telnyx | 1 | 16 | | Custom Telephony | 1 | Concurrency ÷ 20 | So if two form submissions happen simultaneously, both calls can be initiated in parallel as long as you're within your CPS limit. For high-volume scenarios, you may want to implement retry logic with exponential backoff to handle any throttling:

javascript
const maxRetries = 3;
let retryDelay = 1000; // Start with 1 second
for (let i = 0; i < maxRetries; i++) {
  try {
    await makeCall() ;
    break;
  } catch (error) {
    if (error.code === 'rate_limited') {
      await sleep(retryDelay) ;
      retryDelay *= 2; // Exponential backoff
    }
  }
}

​ To learn more, see the sources I considered: [[1] 2025 B2B Guide to AI Phone Calls & Voice Agents | Retell AI | Retell AI](https://www.retellai.com/blog/b2b-guide-to-ai-phone-calls) [[2] Outbound Calls (Make Calls)](https://docs.retellai.com/deploy/outbound-call) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.