Whisper Funlet

This Twilio Function is based on the undocumented Twimlet of the same name (whisper.php).

It can be used as a drop-in replacement for the Twimlet, by using the URL of the Twilio Function as a webhook with the same GET parameters.

Alternatively, it can be customized by setting properties in the environment. GET and POST parameters are considered first, if provided, then environment properties, then config properties declared in the script.

Environment properties are most convenient when you are using a single instance of this script in your account. To customize multiple instances, the recommended way is to modify the script parameters in the config object, directly in the script.

Stages

The Whisper Funlet has two stages:

Stage	Addressing	Description
1	Recipient	Ask recipient to press a key to accept the call
2	Recipient	Bridge the call when a digit has been pressed

These two stages would typically be implemented in two separate Twilio Functions. In the Whisper Funlet, they are running in two separate instances of the same Twilio Function. This is in line with the original Whisper Twimlet, which implemented both stages in the same script.

Input

Message

Text string, a recording URL or a text to say. (A string starting with 'http' is considered to be a URL)

1. Event: Message parameter
2. Environment: FUNLET_WHISPER_MESSAGE environment property
3. Script: message config property

Language

Text string, language code for text messages, e.g. 'en' or 'en-gb'. Defaults to 'en': English with an American accent.

1. Event: Language parameter
2. Environment: FUNLET_WHISPER_LANGUAGE environment property
3. Script: language config property

Voice

Text string, voice for text messages, one of 'man', 'woman' or 'alice'. Defaults to 'alice', who speaks in a large selection languages.

1. Event: Voice parameter
2. Environment: FUNLET_WHISPER_VOICE environment property
3. Script: voice config property

Human Check

Boolean, defaults to false. Whether to request the recipient to press a key to accept the call explicitly.

1. Event: HumanCheck parameter
2. Environment: FUNLET_WHISPER_HUMAN_CHECK environment property
3. Script: humanCheck config property

Digits (Stage 2)

Text string, list of digits pressed.

1. Event: Digits property provided by <Gather>

Output

This Twilio Function returns TwiML instructions for Twilio Voice.