I have a SIP trunked number attached with VAPI but when I transfer call using that to some pstn number it fails Why? Urgent Help @Shubham Bajaj @Vercel @VAPI Tech @Vapi Support Bot

To help troubleshoot: Could you please share the exact error message or call log details you see when the transfer fails? This will help identify if it's a SIP REFER issue, a configuration problem, or something else. Sources: - [Vapi documentation: call forwarding](https://docs.vapi.ai/call-forwarding) - [Vapi SIP Trunking Telnyx external number call forwarding troubleshooting](https://discord.com/channels/1211482211119796234/1343963959421829172) - [Debug call forwarding drops](https://docs.vapi.ai/phone-calling/transfer-calls/debug-forwarding-drops)

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