To resolve the error, please purchase more credits before adding additional concurrency lines.
1. Go to the [Vapi billing credits page](https://dashboard.vapi.ai/org/billing/credits).
2. Enter the desired credit amount and complete your purchase.
Once you have enough credits, you should be able to purchase more concurrency lines without issue.
For more details, see the [November 30, 2024 changelog](https://docs.vapi.ai/changelog/2024/11/30).
Source:
- [Changelog November 30, 2024](https://docs.vapi.ai/changelog/2024/11/30)
v
Vapi Support Bot
11/24/2025, 5:48 PM
Message marked as helpful by @SlaviSavanovic! 🎉
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SlaviSavanovic
11/24/2025, 5:48 PM
Just needed to add more credits. Didn't realize the concurrnecy was credit based - maybe make that a bit more clear
All good on my end you can mark this solved
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Chiranjeet Mishra
11/26/2025, 4:54 PM
Hi, I'm closing this ticket now. Let me know if you need anything else.