TwiML™ Voice： <Number>

<Number> is a noun for the TwiML verb <Dial> and it specifies a phone number to dial. Using the noun's attributes you can specify particular behaviors that Twilio should apply when dialing the number.

<Dial> 動詞で最大 10 件の <Number> 名詞を使用して、全宛先に同時に電話をかけることができます。最初に応答があった電話が現在の通話に接続され、残りの電話は切断されます。各 <Number> 名詞について、webhook を受け取るコールプログレスイベントの種類を指定できます。

名詞の属性

この名詞<Number>は振る舞いを変更する属性をサポートします。

Phone numbers should be formatted with a + and country code, for example: +16175551212 (E.164 format). Twilio will also accept unformatted US numbers, e.g., (415) 555-1212 or 415-555-1212.

sendDigits

The sendDigits attribute tells Twilio to play DTMF tones when the call is answered. This is useful when dialing a phone number and an extension. Twilio will dial the number, and when the automated system picks up, send the DTMF tones to connect to the extension.

url

The url attribute allows you to specify a URL that will return a TwiML response to be run on the called party’s end, after they answer, but before the parties are connected.

You can use this TwiML to privately <Play> or <Say> information to the called party. You could also provide a chance to decline the phone call using <Gather> and <Hangup>. The url attribute does not support any other TwiML verbs.

If the answerOnBridge attribute is used on <Dial>, the current caller will continue to hear ringing while the TwiML document executes on the other end. TwiML documents executed in this manner are not allowed to contain the <Dial> verb.

method

method属性では、Twilioがurl属性で与えられたURLにアクセスする際に、どのHTTPメソッドを用いるかを指定します。デフォルトは POST です。

byoc

The byoc attribute allows you to specify which configured customer BYOC Trunk Twilio should use to route the call to the PSTN. The default is none, in which case the call will be routed via the Twilio Super Network.

statusCallbackEvent

When dialing out to a number using <Dial>, an outbound call is initiated. The call transitions from the initiated state to the ringing state when the phone starts ringing. It transitions to the answered state when the call is picked up, and finally to the completed state when the call is over.

With statusCallbackEvent, you can subscribe to receive webhooks for the different call progress events for a given call: initiated, ringing, answered, or completed. Non-relative URLs must contain a valid hostname (underscores are not permitted).

The statusCallbackEvent attribute allows you to specify which events Twilio should trigger a webhook on. To specify multiple events separate them with a space: initiated ringing answered completed. If a statusCallback is provided and no status callback events are specified, the completed event will be sent by default.

一報APIを通じてアウトバウンドコールが生成されるとき、<Dial>を使ってアウトバウンドコールはすぐさま開始され、キュー(queue)に入ることがありません。下記の返却されうるコールイベントのタイムラインです。異なるコールステータスが<Dial>レグ(leg)で発生します。

statusCallback

statusCallback属性は statusCallbackEvent属性に含まれるそれぞれの指定されたイベントに送るwebhookリクエストのURL特定します。

statusCallbackMethod

statusCallbackMethod属性では、TwilioがstatusCallback属性で与えられたURLにアクセスする際に、どのHTTPメソッドを用いるかを指定します。デフォルトは POST です。

Status Callback HTTP パラメーター

TwilioがTwilio番号の一つのコールを受信した時、Twilioがアプリケーションに渡すStatusCallbackに送信される非同期のリクエスト中のパラメーターはTwiML検索するために非同期のリクエストにパラメーターを含めます。全てのリストと詳細はTwiML Voiceリクエストドキュメントをご覧ください。

コールプログレスイベントが発動された時、コールバックリクエストは、この他にも次のパラメーターを渡します。

サンプル

例 1: sendDigits を使う

In this case, we want to dial the 1928 extension at 415-123-4567. We use a <Number> noun to describe the phone number and give it the attribute sendDigits. We want to wait before sending the extension, so we add a few leading w characters. Each w tells Twilio to wait half a second instead of playing a digit. This lets you adjust the timing of when the digits begin playing to suit the phone system you are dialing.

例 2: 一斉発信

In this case, we use several <Number> tags to dial three phone numbers at the same time. The first of these calls to answer will be connected to the current caller, while the rest of the connection attempts are canceled.

例 3: コールプログレスイベント

In this case, we want to receive a webhook for each call progress event when dialing a number using <Dial>.

例 4：コールプログレスイベントによる複数のダイヤル

In this case, we want to receive a webhook for each call progress event for each number when dialing multiple numbers using <Dial>.

Example 5: Running TwiML Before Parties Are Connected

In this case, we want to connect two parties using <Dial>, but we also want TwiML instructions to be sent to the party we are calling before they are connected to the call. By setting the url attribute, we can specify a URL that will return a TwiML response to be run on the called party’s end. This TwiML will run after they answer, but before the parties are connected.

ヒントとテクニック

• You can specify up to ten numbers within a <Dial> verb to dial simultaneously.
• Simultaneous dialing is useful when you have several phones (or several people) that you want to ring when you receive an incoming call. Keep in mind that the first call that connects will cancel all the other attempts. If you dial an office phone system or a cellphone in airplane mode, it may pick up after a single ring, preventing the other phone numbers from ringing long enough for a human ever to answer. So you should take care to use simultaneous dialing only in situations where you know the behavior of the called parties.