Hoiio Open API




app_id* string
Application ID assigned to your application.
access_token* string
Access Token assigned to your application.
session string
The unique session ID for this particular call.
msg string
The message that you want to play after the call is answered. Max 1000 characters. Languages and Gender To change the language or gender, use the <speech> markup. E.g. <speech language="zh-HK" gender="female">請稍等,我們正在處理您的訂單。</speech> Default language is English and default gender is Female. For the list of supported language and gender, please refer to Text-to-Speech for more details. Custom Recordings If you would like to use your own voice recordings or voice messages recorded via the Record block, use the <url> markup to specify a file for us to use. We will download the file and use it as the voice message. E.g. <url>https://example.com/myrecording.mp3</url> Only HTTP and HTTPS URL are supported. Supported file formats are .mp3, .wav and .gsm (8000 Hz, mono channel). File size must be 10MB or less. Note: There might be a slight delay when downloading the file for the first time. To enable us to cache your file locally for subsequent calls, please include the "Last-Modified" HTTP header. Subsequent calls will not have the delay if we are able to cache your file. If you have updated your file, make sure your file hosting web server respond to our HTTP header "If-Modified-Since" in our request with a "304 Not Modified".
max_duration string
The maximum duration in seconds of the recording. Once the recording limit is reached, the call will automatically move on to the next IVR block. Users can also press # to end the recording at any time. This begin processing of the recording, and we will notify your web server at the provided notify_url upon completion. You will be able to issue the next IVR block upon receipt of this notify. If the user hangs up the call in the middle of the recording, you will still get a recording of what has already been recorded. Valid values are 1-86400. Default value is 120.
tag string
This is a text string containing your own reference ID for this transaction. This value will be included in the response for Notification for your reference. Max 256 characters.
notify_url string
A fully-qualified HTTP/S URL on your web server to be notified when this action has completed execution. The length of this parameter must not exceed 4000 characters. See Controlling IVR Behavior for more details. If omitted, the call will hang up after msg is played, and the notification will not be sent to you.

Result Format



The Record block allows you to record voice messages from the user over the phone. The recordings are then made available to you in MP3 format for download or even as custom messages to be used in other IVR blocks. The download URL for the recording will be sent to your application in the notification.

It is recommended that you play a voice message informing the user before you start recording. You cannot use this block after you have used any of the End blocks (Transfer, Hangup).

Response Parameters

status The result of your request. Refer to Result Status for details.

Result Status

success_ok The request has been processed successfully.
error_invalid_http_method Invalid HTTP method. Only GET or POST are allowed.
error_malformed_params HTTP POST request parameters contains non-readable bytes.
error_X_param_missing A required parameter is missing. X is the name of the parameter that is missing.
error_invalid_access_token Your Access Token is invalid, expired or has been revoked.
error_invalid_app_id Your Application ID is invalid or has been revoked.
error_msg_invalid_length Your msg parameter is too long, must be 500 characters or less.
error_msg_cannot_convert_text There was an error converting msg parameter to speech. Make sure you have selected the correct langauge.
error_msg_download_failed There was an error downloading the custom speech file from your URL.
error_msg_invalid_file_format The custom speech file format is not supported or it has the wrong filename extension. Only .mp3, .wav and .gsm files are supported.
error_msg_invalid_file_size The custom speech file size must be 10MB or less.
error_msg_invalid_url The URL for the custom speech file is invalid.
error_msg_invalid_language The language for msg parameter is not supported. For the list of supported languages, please refer to Text-to-Speech for more details.
error_msg_invalid_gender The gender for msg parameter is not supported. For the list of supported genders, please refer to Text-to-Speech for more details.
error_msg_invalid_xml The XML syntax for msg parameter is invalid.
error_tag_invalid_length tag parameter is too long, must be 256 characters or less.
error_invalid_notify_url Invalid URL in notify_url parameter.
error_unable_to_resolve_notify_url Cannot resolve URL in notify_url parameter.
error_unable_to_complete_ssl_handshake_notify_url Cannot complete SSL Handshake with the provided URL in notify_url parameter. Check if your cert chain is complete using an SSL checker.
error_invalid_session The session is invalid.
error_session_access_denied You do not have access to this session.
error_session_ended The session is ended or expired.
error_session_not_ready The session is not ready for a this request as we are still processing your previous request. You should only send another request when you receive the post notification at the notify_url for the previous request.
error_invalid_max_duration max_duration parameter is invalid.
error_rate_limit_exceeded You have exceeded your request limit for this API. Refer to API Limits for details.
error_internal_server_error There is an unexpected error. Please contact Hoiio support for assistance.


You will receive a notification to your application URL when the Record block has finished executing with the following parameters:

Notification Parameters

ivr_block This is an identifer for the type of block this notification is for. You can use this to differenciate between notifications. This block notification can be identified by the value record.
session This is a unique session ID for this particular call. Include this session in your subsequent requests to select what action to take next.
txn_ref The unique reference ID for this transaction.
from The incoming Caller ID of this call. Phone numbers start with a "+" and country code (E.164 format), e.g. +6511111111. This is present only if the call is an incoming call to a Hoiio Number.
to The dialed number of this call (your Hoiio Number). Phone numbers start with a "+" and country code (E.164 format), e.g. +6511111111. This is present only if the call is an incoming call to a Hoiio Number.
dest The destination number that was called. Phone numbers start with a "+" and country code (E.164 format), e.g. +6511111111. This is present only if the call is an outgoing call made via the Dial block.
tag Your own reference ID submitted in the initial request.
call_state The current state of this call. Possible values are:
  • ongoing - This call has been answered. You should follow up with one of the Middle or End blocks.
  • ended - This call has ended. You should not send any more requests for this call.
record_status The state of the recording. Possible values are:
  • success - The recording was successful, and is available via the record_url parameter for download.
  • failed - The call was ended by the other party before recording could start. No recording was made, thus no record_url is provided in this response.
record_url You can download the recording in MP3 format from this URL. An example of the URL is: https://hoiio.s3.amazonaws.com/recordings/rec-100.mp3?Expires=1640069813 &AWSAccessKeyId=AKIAJR6MXIPT57P5JSDQ&Signature=V32sDkOZ4hXJb%2Ffh3BFSiy%2Bkg%2F0%3D This parameter will not be provided if the recording failed (record_status is failed.)
date Date/time (GMT+8) of this transaction in "YYYY-MM-DD HH:mm:SS" format. This is present only if call_state=ended.
duration Duration of the call in minutes. This is present only if call_state=ended.
currency Currency used for this transaction. Refer to Currency Code for the list of currency code. This is present only if call_state=ended.
rate Per-minute charges (sum of both incoming and outgoing call rates) for this call transaction. This is present only if call_state=ended.
debit Total amount billed for this transaction. This is present only if call_state=ended.

API Limits



The prevailing incoming or outgoing call rate applies. See Charges for Answer and Dial block for details.

If you use the Transfer block later on in this call, an additional outgoing call rate (depending on the destination number of the transfer) will be charged. For details of the incoming and outgoing call rate, please refer to the Pricing Section.