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I do not think there is any useable open source RTP toolkit for J2ME. The reason is that RTP typically require require support from the underlying phone platform. It cannot be done in pure Java. In fact, the standard MMAPI allows RTP connection strings -- the phone would support that if RTP is possible on that device at all.
Hello I'm doing my final work at university and part of it was playing audio and video files received in the phone via RTP. I succeeded for audio, just implementing a custom DataSource and SourceStream, but didn't succeed with video. So you should know that at least audio is possible Regards