D-Link DCS-2670L IP-camera with audio in Blue Iris (howto)

D-Link IP cameras are fairly OK and available IP cameras. On several of my sites I have video surveillance with AI and motion detection incl. thermal and night vision. However the D-Link DCS-2670L wide angle camera is known to be difficult to get working with Audio. Either the audio is crackling, there is no audio or there is distortion. The solution was simple: use DCS2030/21xx RTSP profile in Blue Iris

DCS-2670L setting in Blue Iris
DCS-2670L setting in Blue Iris. Audio and video works.