This counter counts static negative feedback (SNACK) messages exchanged in this ROHC context, which flag a mismatch in the static (rarely changing) header fields rather than the dynamic ones. An admin sees this as a more serious signal than a NACK, since a static-field mismatch typically forces a full context re-initialization rather than a quick dynamic-field update, so a rising SNACK count points to something more disruptive than ordinary packet loss. For example, if rohcRtpContextSNACKs increases right after a device's IP address changes, the static header fields being compressed no longer match, forcing renegotiation of the context.