With this XML tag, you define what the phrase macro will do. Most often, you will "play-file" or "sleep" for a number of milliseconds. Those two actions are the workhorses of audio file concatenation. Another useful action is "say," to correctly pronounce numbers, dates, quantities, currencies, ordinals, spellings, and so on, with consideration of the specific language (for example English, Chinese, and so on) rules. Using the "execute" action, you can invoke any FreeSWITCH API.