sendVoice

Use this method to send audio files, if you want Telegram clients to display the file as a playable voice message. For this to work, your audio must be in an .OGG file encoded with OPUS, or in .MP3 format, or in .M4A format (other formats may be sent as Audio or Document). On success, the sent Message is returned. Bots can currently send voice messages of up to 50 MB in size, this limit may be changed in the future.

Parameter	Type	Required	Description
business_connection_id	String	Optional	Unique identifier of the business connection on behalf of which the message will be sent
chat_id	Integer or String	Yes	Unique identifier for the target chat or username of the target channel (in the format @channelusername)
message_thread_id	Integer	Optional	Unique identifier for the target message thread (topic) of the forum; for forum supergroups only
voice	InputFile or String	Yes	Audio file to send. Pass a file_id as String to send a file that exists on the Telegram servers (recommended), pass an HTTP URL as a String for Telegram to get a file from the Internet, or upload a new one using multipart/form-data.
caption	String	Optional	Voice message caption, 0-1024 characters after entities parsing
parse_mode	String	Optional	Mode for parsing entities in the voice message caption. See formatting options for more details.
caption_entities	Array of MessageEntity	Optional	A JSON-serialized list of special entities that appear in the caption, which can be specified instead of parse_mode
duration	Integer	Optional	Duration of the voice message in seconds
disable_notification	Boolean	Optional	Sends the message silently. Users will receive a notification with no sound.
protect_content	Boolean	Optional	Protects the contents of the sent message from forwarding and saving
allow_paid_broadcast	Boolean	Optional	Pass True to allow up to 1000 messages per second, ignoring broadcasting limits for a fee of 0.1 Telegram Stars per message. The relevant Stars will be withdrawn from the bot's balance
message_effect_id	String	Optional	Unique identifier of the message effect to be added to the message; for private chats only
reply_parameters	ReplyParameters	Optional	Description of the message to reply to
reply_markup	InlineKeyboardMarkup or ReplyKeyboardMarkup or ReplyKeyboardRemove or ForceReply	Optional	Additional interface options. A JSON-serialized object for an inline keyboard, custom reply keyboard, instructions to remove a reply keyboard or to force a reply from the user