I am building an application where I need to calculate the average time take to start responding to the inbound call. This should not be a issue if the concurrent call limit is unlimited, but if there is a cap, what is it? I use U.S Twilio Numbers with the assistant. Is the cap dependent on Twilio or Vapi? If the number of users reaches the limit how does the system will handle?

According to the documentation I found, Vapi has a default concurrency limit of 10 simultaneous calls (combining both inbound and outbound calls). This limit applies at the account level. The concurrent call limit is primarily dependent on Vapi, though Twilio also has its own concurrent call limits based on your number type and service plan. Are you currently on Vapi's Pay-As-You-Go plan or Enterprise plan? This would help me provide more specific information about how the system handles reaching the concurrency limit and how it might affect your average response time calculations. Sources: - [Vapi Billing Limits](https://docs.vapi.ai/billing/billing-limits) - [Discord Channel Discussion](https://discord.com/channels/1211482211119796234/1336441893395103820) - [Discord Channel Discussion](https://discord.com/channels/1211482211119796234/1324731877235359816)

@Vapi Support Bot I currently use twilio pay as you go plan

With Twilio pay-as-you-go plan, Vapi's default concurrency limit of 10 simultaneous calls still applies. When this limit is reached, additional calls will be dropped immediately with an error response:

{
  "message": "Over Concurrency Limit.",
  "error": "Bad Request",
  "statusCode": 400
}

To handle more concurrent calls, you can purchase additional concurrent lines through the Vapi dashboard or consider upgrading to Enterprise for unlimited concurrency. Sources: - [Vapi Billing Limits](https://docs.vapi.ai/billing/billing-limits) - [Discord Channel Discussion](https://discord.com/channels/1211482211119796234/1334473881242832970) - [Discord Channel Discussion](https://discord.com/channels/1211482211119796234/1334251049602777231)

Hey Mahimai Raja. The concurrent calls capacity you limit depends upon your VAPI account. Twilio will also have its own rate limiting for which you have to check Twilio Docs. But on VAPI you get 10 concurrent calls limit by default which is total of your inbound and outbound calls. For every 11th call will be rejected straight forward.