Twiml Dial CallStatus 即使被叫方断开连接也总是“响铃”

Question

我正在尝试使用 Twilio Programmable Voice 在我的应用程序中创建客户端到客户端：

1. 调用者通过“/makecall”API发出调用请求。
2. 手机应用程序设置状态“正在连接”
3. 如果移动应用程序从 Twilio SDK 接收到“响铃”状态，它开始播放“响铃”声音。
4. 如果移动应用程序收到“连接失败”，则显示“无法连接”
5. 如果移动应用程序收到“已连接”，它会停止“铃声”并启动计时器

但看起来 Twilio 总是返回“响铃”，即使被叫方断开连接（我关闭网络甚至卸载应用程序）

我的服务器/makecall函数：

        dial := &twiml.VoiceDial{}
    client := &twiml.VoiceClient{
        Identity:             to,
        StatusCallbackEvent:  "initiated ringing answered completed",
        StatusCallback:       "https://mydemo.app/callstatus",
        StatusCallbackMethod: "POST",
    }
    dial.AnswerOnBridge = "true"
    dial.CallerId = from
    dial.InnerElements = []twiml.Element{client}
    verbList := []twiml.Element{dial}
    twimlResult, err := twiml.Voice(verbList)
    if err != nil {
        return ""
    }
    return twimlResult

/callstatus 被调用 3 次，参数数据如下：

首先发起

ApiVersion  "2010-04-01"
Called  "client:Callee1"
ParentCallSid   "CA6fe3xxx"
CallStatus  **"initiated"**
From    "client:Caller1"
Direction   "outbound-dial"
Timestamp   "Sun, 23 Apr 2023 04:01:16 +0000"
AccountSid  "ACaxxx"
CallbackSource  "call-progress-events"
Caller  "client:Caller1"
SequenceNumber  "0"
CallSid "CA306daxxx"
To  "client:Callee1"

第二次调用状态回调：

ApiVersion  "2010-04-01"
Called  "client:Callee1"
ParentCallSid   "CA6fexxx"
CallStatus  **"ringing"**
From    "client:Caller1"
Direction   "outbound-dial"
Timestamp   "Sun, 23 Apr 2023 04:01:17 +0000"
AccountSid  "ACa19740xxx"
CallbackSource  "call-progress-events"
Caller  "client:Caller1"
SequenceNumber  "1"
CallSid "CA306xxx"
To  "client:Callee1"

最终通话状态回调：

ApiVersion  "2010-04-01"
Called  "client:Callee1"
ParentCallSid   "CA6xxx3"
CallStatus  **"no-answer"**
Duration    "0"
From    "client:Caller1"
Direction   "outbound-dial"
CallDuration    "0"
Timestamp   "Sun, 23 Apr 2023 04:01:23 +0000"
AccountSid  "ACa1xxx"
CallbackSource  "call-progress-events"
SipResponseCode "487"
Caller  "client:Caller1"
SequenceNumber  "2"
CallSid "CA3xxx"
To  "client:Callee1"

想知道如果被叫方断开连接，为什么 CallStatus 返回“正在响铃”？

尝试使用 Twilio SDK 处理移动应用程序上的呼叫流程