This is a known intermittent issue with Vapi where outbound calls may remain scheduled and not trigger, often with no webhooks sent or call logs generated. As there is no definitive fix documented, the best next step is to contact Vapi support with your campaign details and recent call IDs for investigation. You can also double-check that no SIP trunk or webhook configurations were changed, as these are sometimes linked to the problem.
If you need to escalate, consider scheduling a call with Vapi support as suggested in the documentation.
Source:
- [Vapi outbound call not triggering (Discord)](
https://discord.com/channels/1211482211119796234/1341449578100031488)