You can find out if you check the Twilio Call Logs. You'll get the exact reason there https://cdn.discordapp.com/attachments/1211484481848873020/1358225381580083260/6ZnoAQx3q9AAAAAASUVORK5CYII.png?ex=67f31175&is=67f1bff5&hm=9b2ab698165144a1d1fe3a8f1a6b17f398fdd3a8503a769c9a8fa484d15bcbe3&