Hello, is there a way to avoid a re call when user doesnt asnwer the call?

In VAPI natively, I don't believe so unless you want to do a bunch of api work before every call to pull the call records for that customer and not intiate a call. I track the result of each call in my backend and based on determine if next call needs to be scheduled or not.

ty for answer, i was doing that way but it seens vapi is calling by its own when there is not answer, so its call by vapi and my backend retry

Enable voicemailDetectionEnabled, check if endedReason is customer-did-not-answer, and handle it by skipping re-calls and triggering a fallback like SMS or scheduling outside the current session..