Plays an essential role in the inhibition of host immune response. Prevents the establishment of cellular antiviral state by blocking interferon-alpha/beta (IFN-alpha/beta) production and signaling pathway. Interacts with host IFIH1/MDA5 and DHX58/LGP2 to inhibit the transduction pathway involved in the activation of IFN-beta promoter, thus protecting the virus against cell antiviral state. Efficiently blocks type I IFN signaling following infection by targeting host STAT2 for proteasomal degradation (By similarity). Interacts with host IFIH1/MDA5 and DHX58/LGP2. Forms with host DDB1, CUL4A, STAT1 and STAT2 the HPIV2 virus V-dependent complex (VDC); this complex targets host STAT2 to proteasomal degradation (By similarity). Partially edited. RNA editing at this position consists of an insertion of two guanine nucleotides. The sequence displayed here is the V protein, derived from the unedited RNA. The edited RNA gives rise to the P protein (AC P23056). Belongs to the paramyxoviruses V protein family.