It has been nearly a year since this feature was 'completed', and there's still no documentation for how to use it.

PRIM_COLLISION_SOUND has a value of 53.

It was added, and marked as "COMPLETE" on January 17, 2025

It is not represented on https://wiki.secondlife.com/wiki/LlSetPrimitiveParams, and the constants tables are not editable by wiki contributors.

See: https://feedback.secondlife.com/scripting-features/p/add-prim-collision-sound-function-to-llsetlinkprimitiveparams-suite