I tired to do 2 calls at the same time (make.com API Call), but only one goes through. I use a twilio imported number - so I think 10 calls should be possible at the same time. How can I make sure that I can do 2-10 calls at the same time? Thanks!

To enable 2-10 simultaneous calls, check and increase your Vapi concurrency limit: Go to your [Vapi Dashboard billing settings](https://dashboard.vapi.ai/settings/billing), find your current concurrency limit, and upgrade it if needed. Twilio supports multiple calls, but Vapi limits how many can be active at once—raising this limit will allow more concurrent calls to go through. Source: - [Call queue management with Twilio](https://docs.vapi.ai/calls/call-queue-management)

the concurrency limit is 10, so it should work

Only 1 concurrent call per Twillio number by default - this is a Twillio setting and you can increase a concurrency limit in their settings but it is an account wide and not number scoped setting and it costs extra

It sounds like your issue is caused by concurrency limits rather than the Twilio number itself — even though a Twilio number can support multiple outbound calls, your Make.com scenario or API module may only allow one execution at a time. To enable 2–10 simultaneous calls, you need to increase the scenario’s maximum concurrent runs in Make.com, ensure the HTTP/API module isn’t set to “sequential” mode, and verify that your Twilio account has no call-rate restrictions or voice concurrency caps. Once concurrency is enabled on both Make.com and Twilio, multiple calls will be triggered and processed at the same time without blocking each other.

thanks @Vidmantas @Lakshay Julka I tried your suggestions, but still have the same problem. I went to the Twilio Room Settings and it says 10000 In make Sequential processing is disabled and I set max number of cycles to 10. Not sure about where I can set the HTTP/API module to sequential mode. Please let me know if I missed a setting or I did something wrong. https://cdn.discordapp.com/attachments/1443183632113074207/1443527645605134498/Screenshot_2025-11-27_at_10.01.49.png?ex=69296562&is=692813e2&hm=9cc423c193c65a11de9dc0d7d82d75bc8bc7c6c1e09c1e8434d2f43b784bb7e7& https://cdn.discordapp.com/attachments/1443183632113074207/1443527645869379614/Screenshot_2025-11-27_at_10.03.17.png?ex=69296562&is=692813e2&hm=bfaa542fddcdcae809a8b8ba1877565aa38b0c7e2682073dab42178540a30821& https://cdn.discordapp.com/attachments/1443183632113074207/1443527646100328500/Screenshot_2025-11-27_at_10.03.24.png?ex=69296562&is=692813e2&hm=8a353b34ee0b662d2d122ebbeb0aa7f5c8ded39214932450b72ed3118bd14527&

Go to Voice → Settings → General → Calls per second (CPS) and raise the value

thanks!

Is your problem solved or not ?

Solved. Was Not Able to change the unsolved to solved Button

okk great