public sealed class ListVoicesRequest : IMessage<ListVoicesRequest>, IEquatable<ListVoicesRequest>, IDeepCloneable<ListVoicesRequest>, IBufferMessage, IMessage
The top-level message sent by the client for the ListVoices method.
Optional. Recommended.
BCP-47 language tag.
If not specified, the API will return all supported voices.
If specified, the ListVoices call will only return voices that can be used
to synthesize this language_code. For example, if you specify "en-NZ",
all "en-NZ" voices will be returned. If you specify "no", both
"no-\*" (Norwegian) and "nb-\*" (Norwegian Bokmal) voices will be
returned.