Oh really ? Sipdroid does support G.711mu only, which a) never fits into narrow GPRS/EDGE bandwidth, b) incredibly sensitive to network fluctuations, lags and p

Oh really ? Sipdroid does support G.711mu only, which a) never fits into narrow GPRS/EDGE bandwidth, b) incredibly sensitive to network fluctuations, lags and packet loss. So I believe you are a little bit unfair in regards of Sipdroid voice qality :-). Even Speex and G.729 hardly fit into poor GPRS/EDGE, trust me as experienced VoIP developer. Also Sipdroid has a bug in RTP class which introduces huge latency, somehow they don't event want to fix it although they were pointed to it many times.