Webhooks only dont work in outbound calls
# support
c
I've encountered this issue with VAPI, that only incoming calls are firing webhooks, outgoing calls are not firing end-of-call webhooks. One of the outgoing calls with the issue is this one: **Call-ID: **0199c2bb-3bca-7ddf-94f6-52fb648f2feb **Time: **9:34:17 AM(+02:55.63) Additional Information: Screenshots and reproduction steps on this link or the attached screenshots here: https://app.screencast.com/nlwQuEIFtH5Zv Methods tried: - Outbound Call triggered by API (Dont work) - Outbound Call triggered by Web-Interface (Dont work) - Inbound Call (Works, but not the use-case for us) - Talk to Assistant (Works, but not the use-case for us) Already tried attempts: - Changing the webhook site url - Changed the assistant json for API call - Changed the webhook endpoint service (debugging http bin) Observations: - Call logs are created, end call event in outbound triggered by assistant works - Webhook logs is not inserting any webhook log for outbound calls by api - Webhooks for incoming calls are fired Used tools: - Vonage - Deepgram Nova - Elevenlabs Flash 2.5 - GPT 4.1 https://cdn.discordapp.com/attachments/1425397917451161662/1425397917799284857/2025-10-08_09-36-58.png?ex=68e770c2&is=68e61f42&hm=7de5ff4317a179a2dc38fa593e32f3c475827abb23c6e5128c1767e7a7c6dfb7& https://cdn.discordapp.com/attachments/1425397917451161662/1425397918348873790/2025-10-08_09-40-27.png?ex=68e770c2&is=68e61f42&hm=789223441fb1f91ede0db8a42eac447291f2e70d66449c5006e825588c416f0f& https://cdn.discordapp.com/attachments/1425397917451161662/1425397918747066418/2025-10-08_09-43-38.png?ex=68e770c2&is=68e61f42&hm=c88bcb0c9de6d4619d47e4dea05a65799b80f3820de79707730ab45a583fb658& https://cdn.discordapp.com/attachments/1425397917451161662/1425397919019962418/2025-10-08_10-10-32.png?ex=68e770c2&is=68e61f42&hm=b860d22d90a92051b8d7a3906abd01e9a5eb3280f0dcc66192d62df2889bed67& https://cdn.discordapp.com/attachments/1425397917451161662/1425397919451844789/2025-10-08_10-11-37.png?ex=68e770c2&is=68e61f42&hm=cc2b93d251bdebe9c43238b973673d524573ce1a508dea6a11ef05b617e50944& https://cdn.discordapp.com/attachments/1425397917451161662/1425397919711887451/2025-10-08_10-13-35.png?ex=68e770c2&is=68e61f42&hm=c3114a2dad1a4f2421f29a8bcc36951226c6a7fbfb0ef9fa917ddf7be681a16c&
Okay, whoever have the same problem: the server parameter is not used, u need to set in the assistant json an additional field with the name "serverUrl" with the webhook url. The VAPI interface is misleading here.
3 Views