Send single voice message

An audio file can be delivered as a voice message to the recipients. An audio file must be uploaded online, so that the existing URL can be available for file download. Size of the audio file must be below 4 MB. Supported formats of the provided file are mp3 and wav. Our platform needs to have permission to make GET and HEAD HTTP requests on the provided URL. Standard http ports (like 80, 8080, etc.) are advised.

Message to be converted to speech and played to subscribers. Message text can be up to 1400 characters long and cannot contain only punctuation. SSML (Speech Synthesis Markup Language) is supported and can be used to fully customize pronunciation of the provided text.

If the message is in text format, the language in which the message is written must be defined for correct pronunciation. More about Text-to-speech functionality and supported TTS languages can be found here. If not set, default language is English [en]. If voice is not set, then default voice for that specific language is used. In the case of English language, the voice is [Joanna].

Numeric sender ID in E.164 standard format (Example: 41793026727). This is caller ID that will be presented to the end user where applicable.

Phone number of the recipient. Phone number must be written in E.164 standard format (Example: 41793026727).

The ID that uniquely identifies the request. Bulk ID will be received only when you send a message to more than one destination address.