I have tested all of the codecs:
MP2L2 - No Audio on Web
G.722.1 - No Audio on Web
G.711alaw - Audio on Web / Works in Media Player with HIKVISION Codec
G.711ulaw - Audio on Web / Works in Media Player with HIKVISION Codec
G.726 - Audio on Web / Doensn't Work to Well in Media
None of the five...