How does Apple 6 send voice via SMS?

Open the SMS sending interface of imessage, and then we can enter the other party's mobile phone number, but our users must open iMessage, and then we can click the microphone button on the right side of the input box to start the voice recording release.

After recording, we just need to click the send button.

Note: If we want to realize voice message with the other party, we must turn on iMessage. If the other party doesn't open iMessage, you can't send voice.