Twilio并行拨号未接时如何触发twimlet语音信箱而非个人手机应答机

问题根本原因 #

你配置的被叫手机号的运营商语音信箱触发时间短于Twilio默认的拨号超时时间，运营商语音信箱先接入呼叫时，Twilio会判定呼叫已被正常接听，因此不会触发你配置的Twimlet失败回调逻辑。

解决方案 #

• 给<Dial>标签添加timeout属性，将拨号超时时间设置为15-18秒，短于运营商语音信箱的默认触发时长（通常为20-25秒）
• 给每个<Number>子标签添加answerOnBridge="true"属性，仅当被叫方人工接听时才判定为呼叫接通，过滤掉运营商语音信箱、自动应答等系统接入的场景
• 修正你当前FailUrl中的参数编码错误，你现有配置中Email%myemail缺少参数分隔符编码，正确写法应为Email%3Dmyemail%2540gmail.com
• 可选配置：给<Dial>标签添加ifMachine="Hangup"属性，检测到自动应答场景时直接挂断，强制走后续语音信箱逻辑

修正后的示例代码 #

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial action="https://twimlets.com/forward?FailUrl=https%3A%2F%2Ftwimlets.com%2Fvoicemail%3FEmail%3Dmyemail%2540gmail.com%26Message%3DSorry%2520we%2520are%2520unavailable%252C%2520please%2520leave%2520a%2520voicemail%2520here%2520and%2520let%2520us%2520know%2520what%2520you%2520need%2520and%2520we%2520will%2520get%2520back%2520to%2520you%2520shortly%252C%2520thank%2520you.%26Transcribe%3Dtrue&amp;Dial=true" 
      record="record-from-answer" 
      callerId="+13151234567"
      timeout="18"
      answerOnBridge="true"
      ifMachine="Hangup">
    <Number url="https://handler.twilio.com/twiml/EH8253d4550bfdaf385b2b2ac15e0a4392" answerOnBridge="true">3155554444</Number>
    <Number url="https://handler.twilio.com/twiml/EH8253d4550bfdaf385b2b2ac15e0a4392" answerOnBridge="true">7165554444</Number>
</Dial>
</Response>

内容的提问来源于stack exchange，提问作者user1193480