RFC 3551 RTP A/V Profile July 2003 4.five.1 DVI4 DVI4 employs an adaptive delta pulse code modulation (ADPCM) encoding plan that was specified with the Interactive Multimedia Association (IMA) because the "IMA ADPCM wave style". Nonetheless, the encoding defined below as DVI4 differs in three respects from your IMA specification: o The RTP DVI4 hea