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Buffers[x].Num

Index 0 Large	Index 1 Medium	Index 2 Small
248	263 if PRI, else 0	496

Buffers[0].Num specifies the number of buffers available for play and record. By default, two buffers are allocated per channel. For simultaneous play and record, you must configure four buffers per channel.
Buffers[1].Num is for ISDN. Buffers[2].Num is required for NMS Fusion systems.