Plays a role in the inhibition of the host NF-kappa-B pathway. This inhibition occurs at the receptor level, by preventing the signaling of TNFR1 as well as IL-1R and TLR3. Interacts with host TNFRSF1A, RIPK1 AND IRAK1; these interactions interfere with host NF-kappa-B activation at the level of receptor complexes (By similarity). Interacts with host protein UBQLN4 (By similarity). Belongs to the rubulavirus small hydrophobic protein family.