This is a read-only true/false flag reporting whether the AMR-NB payload for this active call employs robust sorting, applicable only when the call uses octet-aligned RTP framing and the negotiated coder is AMR-NB. An admin checks this to see whether this loss-resilience feature, which reorders payload bits to better tolerate packet loss, was actually negotiated for a live call. For example, on a lossy network path, an admin might specifically check that this feature is active on AMR-NB calls to confirm the resilience mechanism is actually helping rather than assuming it's on by default.