### Answer Concurrency refers to the number of simultaneous active voice calls that can be handled by your system at any given moment [(1) ]() . For example, if 15 users are engaged in voice calls with your agents at the same time, that counts as 15 concurrent calls . Pay-As-You-Go users are allocated a quota of 20 concurrent calls . If your operational needs require additional concurrency, you can upgrade your plan through the Billing page . Each agent within your plan is capable of handling an unlimited number of calls, provided that the total concurrency remains within your designated quota . This means you don't need to create multiple agents to manage multiple calls concurrently . Concurrency applies to all simultaneous active voice calls across your entire organization, not to a single agent [(2) ]() . You can check your current number of concurrent calls in the dashboard [(1) ]() .

​ 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) ​

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