As Gulu said, the streaming is internal only. It is still using a local wave file, it just handles it in a way that to the caller sounds like a stream.
When you set it up under System->Music Streams, you choose a Name and Wave file path, and a type.
These are the types:
System-Wide: The audio stream is continuous. When callers enter the queue, they hear the audio at that position in time.
Per-Call: The audio stream starts from the beginning for each call in queue, and then plays continuously. A caller hears the audio from the beginning when they first enter the queue; if they reenter the queue they hear the audio at that position in time.
Per-Caller: The audio stream starts from the beginning for each call in the queue, and then pauses when the call leaves the queue. A caller hears the audio from the beginning when they first enter the queue; if they reenter the queue they hear the audio at the point where they left off.
Play Prompt: The audio stream starts from the beginning for each call in the queue. A caller hears the audio from the beginning when they first enter the queue; if they reenter the queue they hear the audio from the beginning again.
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