### Answer
It appears you're encountering an issue where calls end prematurely with the reason "customer-did-not-answer," despite active engagement within the call. This behavior isn't directly addressed in the provided documentation, suggesting it may be an unexpected or unique issue.
For resolving this specific problem, consider checking your call setup configurations and ensuring that all settings are correctly implemented as per Vapi documentation. Additionally, examining the call logs and configurations for any discrepancies that might lead to this issue could be beneficial.
For further assistance and a more detailed investigation, I recommend reaching out to Vapi support directly at [Contact Us](
support@vapi.ai).