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Intermittant choppy voice, output packet drops for single G.711 call across a 256Kbps frame relay PVCs

Core Issue

Frame relay sub-interfaces do not have simple Frame Relay map classes applied to reflect their individual bandwidths. If you do not create a class map and apply it to each of their DLCIs the router will assume a CIR of 56K.

This issue will cause output drops on the main serial interface and will cause choppy voice even if a service-policy for Low latency queuing (LLQ) is applied to the interface

Resolution

Create a frame-relay map-class and apply the LLQ service policy and the appropriate frame relay CIR.

For further information, refer to: VoIP over Frame Relay with Quality of Service (Fragmentation, Traffic Shaping, LLQ/ IP RTP Priority)

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