Hi Retell team, We are scaling outbound and have run into a high dial_failed rate. Our Twilio number attached to agent has been around for years, and is compliant with STIR/SHAKEN requirements. Today’s dial_failed rate was 57%, which is incredibly disruptive. Tried the documentation to no avail. C…

I don’t have access to internal SBC/SIP traces, regional routing logs, or detailed TLS handshake diagnostics for specific call IDs. As an AI assistant for Retell AI documentation, I can only provide information that’s explicitly documented in the available sources. However, I can guide you on what’…

477 SIP Dial Failed Rate Excessively High

Support Help

Omar_Ashraf March 3, 2026, 9:41pm 21

Hello @Jaime_Ferrer

Can you share the PCAP file for this call

You can dm it to me or send it to suppor@retellai.com

let me know when you do it so I can check it.

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477 SIP Dial Failed Rate Excessively High

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