Does your app support Audio over MJPEG directly from the IP camera?
3GPP and RTSP have long been standard and widely adopted to send audio/video streams to mobile devices.
Even Apple's web site calls 3GPP & 3GGP2 "the worldwide standards for the creation, delivery and playback of multimedia over 3rd generation, high-speed wireless networks." (
http://www.apple.com/quicktime/technologies/3gpp/). Funny how the hypocrites at Apple don't support them, or their own Quicktime app, within iPhone OS.
Only recently has MPEG-4 and H.263 started to be used more widely in IP cams. MJPEG is old/inefficient and does not carry audio well in many cases.
I hope you will support RTSP and/or 3GPP as these are the methods all recent/decent IP cams use.