Body

• To string(endpoint) Required

  The phone number, SIP address, or client identifier to call.

• From string(endpoint) Required

  The phone number or client identifier to use as the caller id. If using a phone number, it must be a Twilio number or a Verified outgoing caller id for your account. If the to parameter is a phone number, From must also be a phone number.

• Method string(http-method)

  The HTTP method we should use when calling the url parameter's value. Can be: GET or POST and the default is POST. If an application_sid parameter is present, this parameter is ignored.

  Values are GET or POST.

• FallbackUrl string(uri)

  The URL that we call using the fallback_method if an error occurs when requesting or executing the TwiML at url. If an application_sid parameter is present, this parameter is ignored.

• FallbackMethod string(http-method)

  The HTTP method that we should use to request the fallback_url. Can be: GET or POST and the default is POST. If an application_sid parameter is present, this parameter is ignored.

  Values are GET or POST.

• StatusCallback string(uri)

  The URL we should call using the status_callback_method to send status information to your application. If no status_callback_event is specified, we will send the completed status. If an application_sid parameter is present, this parameter is ignored. URLs must contain a valid hostname (underscores are not permitted).

• StatusCallbackEvent array[string]

  The call progress events that we will send to the status_callback URL. Can be: initiated, ringing, answered, and completed. If no event is specified, we send the completed status. If you want to receive multiple events, specify each one in a separate status_callback_event parameter. See the code sample for monitoring call progress. If an application_sid is present, this parameter is ignored.

• StatusCallbackMethod string(http-method)

  The HTTP method we should use when calling the status_callback URL. Can be: GET or POST and the default is POST. If an application_sid parameter is present, this parameter is ignored.

  Values are GET or POST.

• SendDigits string

  The string of keys to dial after connecting to the number, with a maximum length of 32 digits. Valid digits in the string include any digit (0-9), 'A', 'B', 'C', 'D', '#', and '*'. You can also use 'w' to insert a half-second pause and 'W' to insert a one-second pause. For example, to pause for one second after connecting and then dial extension 1234 followed by the # key, set this parameter to W1234#. Be sure to URL-encode this string because the '#' character has special meaning in a URL. If both SendDigits and MachineDetection parameters are provided, then MachineDetection will be ignored.

• Timeout integer

  The integer number of seconds that we should allow the phone to ring before assuming there is no answer. The default is 60 seconds and the maximum is 600 seconds. For some call flows, we will add a 5-second buffer to the timeout value you provide. For this reason, a timeout value of 10 seconds could result in an actual timeout closer to 15 seconds. You can set this to a short time, such as 15 seconds, to hang up before reaching an answering machine or voicemail.

• Record boolean

  Whether to record the call. Can be true to record the phone call, or false to not. The default is false. The recording_url is sent to the status_callback URL.

• RecordingChannels string

  The number of channels in the final recording. Can be: mono or dual. The default is mono. mono records both legs of the call in a single channel of the recording file. dual records each leg to a separate channel of the recording file. The first channel of a dual-channel recording contains the parent call and the second channel contains the child call.

• RecordingStatusCallback string

  The URL that we call when the recording is available to be accessed.

• RecordingStatusCallbackMethod string(http-method)

  The HTTP method we should use when calling the recording_status_callback URL. Can be: GET or POST and the default is POST.

  Values are GET or POST.

• SipAuthUsername string

  The username used to authenticate the caller making a SIP call.

• SipAuthPassword string

  The password required to authenticate the user account specified in sip_auth_username.

• MachineDetection string

  Whether to detect if a human, answering machine, or fax has picked up the call. Can be: Enable or DetectMessageEnd. Use Enable if you would like us to return AnsweredBy as soon as the called party is identified. Use DetectMessageEnd, if you would like to leave a message on an answering machine. If send_digits is provided, this parameter is ignored. For more information, see Answering Machine Detection.

• MachineDetectionTimeout integer

  The number of seconds that we should attempt to detect an answering machine before timing out and sending a voice request with AnsweredBy of unknown. The default timeout is 30 seconds.

• RecordingStatusCallbackEvent array[string]

  The recording status events that will trigger calls to the URL specified in recording_status_callback. Can be: in-progress, completed and absent. Defaults to completed. Separate multiple values with a space.

• Trim string

  Whether to trim any leading and trailing silence from the recording. Can be: trim-silence or do-not-trim and the default is trim-silence.

• CallerId string

  The phone number, SIP address, or Client identifier that made this call. Phone numbers are in E.164 format (e.g., +16175551212). SIP addresses are formatted as name@company.com.

• MachineDetectionSpeechThreshold integer

  The number of milliseconds that is used as the measuring stick for the length of the speech activity, where durations lower than this value will be interpreted as a human and longer than this value as a machine. Possible Values: 1000-6000. Default: 2400.

• MachineDetectionSpeechEndThreshold integer

  The number of milliseconds of silence after speech activity at which point the speech activity is considered complete. Possible Values: 500-5000. Default: 1200.

• MachineDetectionSilenceTimeout integer

  The number of milliseconds of initial silence after which an unknown AnsweredBy result will be returned. Possible Values: 2000-10000. Default: 5000.

• AsyncAmd string

  Select whether to perform answering machine detection in the background. Default, blocks the execution of the call until Answering Machine Detection is completed. Can be: true or false.

• AsyncAmdStatusCallback string(uri)

  The URL that we should call using the async_amd_status_callback_method to notify customer application whether the call was answered by human, machine or fax.

• AsyncAmdStatusCallbackMethod string(http-method)

  The HTTP method we should use when calling the async_amd_status_callback URL. Can be: GET or POST and the default is POST.

  Values are GET or POST.

• Byoc string

  The SID of a BYOC (Bring Your Own Carrier) trunk to route this call with. Note that byoc is only meaningful when to is a phone number; it will otherwise be ignored. (Beta)

  Minimum length is 34, maximum length is 34. Format should match the following pattern: ^BY[0-9a-fA-F]{32}$.

• CallReason string

  The Reason for the outgoing call. Use it to specify the purpose of the call that is presented on the called party's phone. (Branded Calls Beta)

• CallToken string

  A token string needed to invoke a forwarded call. A call_token is generated when an incoming call is received on a Twilio number. Pass an incoming call's call_token value to a forwarded call via the call_token parameter when creating a new call. A forwarded call should bear the same CallerID of the original incoming call.

• RecordingTrack string

  The audio track to record for the call. Can be: inbound, outbound or both. The default is both. inbound records the audio that is received by Twilio. outbound records the audio that is generated from Twilio. both records the audio that is received and generated by Twilio.

• TimeLimit integer

  The maximum duration of the call in seconds. Constraints depend on account and configuration.

• Url string(uri)

  The absolute URL that returns the TwiML instructions for the call. We will call this URL using the method when the call connects. For more information, see the Url Parameter section in Making Calls.

• Twiml string(twiml)

  TwiML instructions for the call Twilio will use without fetching Twiml from url parameter. If both twiml and url are provided then twiml parameter will be ignored. Max 4000 characters.

• ApplicationSid string

  The SID of the Application resource that will handle the call, if the call will be handled by an application.

  Minimum length is 34, maximum length is 34. Format should match the following pattern: ^AP[0-9a-fA-F]{32}$.