This is the message I get when trying to call the number. "Your sever rejected assistant request webhook. Error request failed with status code 500."

Hi there! 👋 I can't definitively confirm if your specific error is caused by SIP issues without more details about your setup, but I can certainly help explain how SIP issues could potentially cause this webhook error. Based on the information I've found, SIP issues can indeed cause webhook errors like the one you're experiencing. According to [documentation I've found](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1340082214146146435), SIP-related issues can specifically cause "500" errors when transferring calls. There's also evidence that [SIP transfer issues can result in Error 500](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1340082214146146435) when transferring to VAPI SIP from an Asterisk server. The error message "Your server rejected assistant request webhook. Error request failed with status code 500" indicates a server-side issue. This could be related to several potential causes: 1. **SIP Configuration Issues**: Problems with firewall configurations, SIP ALG interference, or SIP system compatibility could be causing call failures that trigger webhook errors. 2. **Network Connectivity**: [SIP gateway connection failures](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1342559415471046656) can result in calls not being connected, potentially triggering webhook errors. 3. **Server Configuration**: The server might be rejecting the webhook due to incorrect configuration, authentication issues, or data format problems. 4. **Webhook URL Configuration**: Ensure your webhook URL is correctly configured in the VAPI platform. To troubleshoot this issue, I'd recommend checking your SIP configuration, reviewing server logs for errors, verifying your webhook configuration, and ensuring there are no network connectivity issues between your systems. Is there any additional information about your setup that you could share to help narrow down the cause? Sources:

This has been resolved.

Marking this ticket as Solved ✅