​ To learn more, see the sources I considered: [[1] Understand concurrency & limits](https://docs.retellai.com/deploy/concurrency) [[2] concurrency calls](https://discord.com/channels/1186424376300679209/1460538188576592017) [[3] Streamline Calls with Retell AI’s Batch Dialer | Retell AI](https://www.retellai.com/blog/boost-operation-efficiency-with-retell-ais-batch-calling) [[4] Platform Changelogs | Retell AI](https://www.retellai.com/changelog) ​

### Answer Here's how outbound batch calling and concurrency work together: ## Concurrency Concurrency refers to the number of simultaneous active voice calls your system can handle at any given moment. [(1) ]() - Pay-As-You-Go users are allocated a quota of 20 concurrent calls. - Each agent can handle an unlimited number of calls, provided the total concurrency remains within your quota. - Concurrency applies to all simultaneous active voice calls across your entire organization, not to a single agent. [(2) ]() ## Batch Calling Batch Calling allows you to make multiple calls simultaneously by uploading a CSV/Excel file. [(3) ]() Key points: - Batch Calling queues your calls without hitting concurrency limits, ensuring a seamless experience. - You can choose Send Now (dispatch immediately) or Scheduled Time (send at a future time) . - Pricing is $0.005 per dial (20k calls for $100) . ## Concurrency Burst If you need to temporarily exceed your standard concurrency limit during peak demand, you can enable Concurrency Burst. [(1) ]() - Calls within your normal limit proceed as usual. - Calls exceeding your limit (up to the burst limit) proceed with an additional $0.10/min surcharge. - Burst limit is the lower of: 3× your concurrency limit OR your concurrency limit + 300. ## Reserved Concurrency You can set Reserved Concurrency to reserve a number of concurrency slots for other calls (outside of batch) . [(4) ]()

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