Voice buffer underrun
While playing voice data with PlayPrompt, PlayAudioName, PlayGreeting, PlayVoiceMessage, or PlayVoiceSegment the device driver unexpectedly ran out of voice data to play. The system continues to play voice data when more is available, but the caller will hear a pause in the voice.
This is probably caused by the voice input buffer to the device driver being too small, and is most likely to happen when the system is heavily loaded. Increase the size of the buffer using the Normal Play/Record Max Data system parameter.
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Log, System Monitor