From the knowledge base article quoted in the artical you reference:
Quote:
Using the right transport method
Wi-Fi® technology is the preferred transport because it is fast and free. If a Wi-Fi connection becomes available during a streaming session, it is recommended that the Player dynamically switch to the Wi-Fi connection after prompting the BlackBerry smartphone user to do so. If a Wi-Fi connection is not available, transport methods that are used by wireless service providers, such as Wireless Application Protocol (WAP/WAP2) or Transmission Control Protocol (TCP), are recommended. Using the BlackBerry® Mobile Data System (BlackBerry MDS) or the BlackBerry® Internet Service is not recommended because media streaming results in large data usage through these transport methods. Both the BlackBerry MDS and BlackBerry Internet Service also result in added latency because the data travels through the BlackBerry® Infrastructure.
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If, as it appears, you are trying to stream the media through your BES, be aware that MDS does not support RTSP, and may have size limitations configured that are affecting your program.