This read-write CCallControlJitterDelayMode selects whether a call's jitter buffer is adaptive (DSP dynamically picks a size between configured min and max delays, starting from the nominal delay) or fixed (held constant at the nominal delay for the whole call). An administrator chooses fixed mode for predictable, stable network paths and adaptive mode where jitter varies over the call's duration. For example, setting this to adaptive(1) lets the DSP shrink or grow the jitter buffer in real time as network conditions change.