Voice Adaptive Traffic Shaping is only acailable with MQC-based Frame-Relay traffic shaping, and only with LLQ enabled in sharper-queue. The goal of VATS is to throttle the PVC's sending rate once the system detected voice packets in the priority queue. The VATS feature is useful in the oversubscription scenaiio, where the customer sends traffic over the CIR. When the voice packet comes in the priority queue. the system will signal the shaper to slow its rate down to ensure router will never drop or delay any voice packets.
Command
policy-map class
shape fr-voice-adapt <deactivation N>
where N = number of seconds to deactivate shaping after the last voice packet has been seen in the priority queue.
Referecence
CCIE R&S lab INE workbook I v5.0
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