www.open-source-soft.narod.ru/DTMF_JAVA.7z Description: DTMF detector and generator is written completely on JAVA. It use fixed-point format so it fast and can be used on any platforms, including CLDC configuration.
http://www.open-source-soft.narod.ru/dtmf_cs.7z C# DTMF detector and generator classes. It was used completely fixed point arithmetic, so algorithms as fast as possibly.
VoIP's project with Speex codec, speech detecting and crypto coding with traffic counting. All code is a pure Java, so completely cross-platforms. Traffic is about 9 MB per hour in both ends, sources: http://www.open-source-soft.narod.ru/arrow.7z