On page 368 under Detecting Speech on a Call

The sample code shows that the recorder should still respond to the VoiceActivityChanged event even while paused, but I'm unable to get that to work. While the recorder is paused, the event does not fire. I am using the most recent release of UCMA 3 for the project.

I need to be able to output a seperate audio file whenever somebody speaks on the conference. I know that sounds odd, but the amount of voice traffic isn't very much and each event needs to be recorded.

You're right, that sample is misleading as it's written. To have a separate file for each time someone speaks, your best bet is to keep the Recorder running continually, and check the TimeStamp property on the event args every time your VoiceActivityChanged event handler is invoked as well as the IsVoice property. You can then keep track of every time the voice activity started or stopped, and trim the single WMA file produced by the Recorder into separate files using those times.

Hope this helps, and let me know if you have follow-up questions.

Michael