Retrieves a list of available voices for assistants, optionally filtered by language.
(Required) Your Ringg AI API key.
"7251cb4b-3373-43a4-844c-b27a1d45e0c9"
Filter voices by language (e.g., 'en-US', 'hi-IN'). Multiple languages can be comma-separated.
Successful Response: A list of available voices.