When you have done this setup once you do not need to repeat it for further calls unless you change any of the streaming parameters (such as bitrate or codecs etc). If you have to create further announcement files then retain your previous ones for use in other calls.
NOTE: It is possible to create a .nsc file with multiple stream formats within it. This is very useful for handling the multiple bitrates available on the archiving lines. See the Windows Media Services documentation for further information.
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