Hi, Thanks for this library. It is a very good job. I am trying to make a MRCP client for iPhone. I have made a SIP client for iPhone to test the library. For the audio device, I have used the iphonesound.c of Siphon (thanks to Samuel Vinson). For the SIP client, I have used pjsua, so the implementation of the RTP was made easier. But for the MRCP client, I just use pjmedia but I have a problem : my application send RTP packet but the packet size is 0. I wanted to test the audio device like is descibed in Audio Device API but it say to include pjmedia_audidev.h. I do not find it in pjproject (my version is 1.0). Did the Audio Device API have changed? How can I test my audio device? Or perhaps someone have an idea why the packet size is zero. I use G711 pcmu codec. clock_rate = 8000 channel_count = 1 bits_per_sample = 16 samples_per_frame = 160 bytes_per_frame = 160 If you need more informations to help me, ask me because I do not know where the problem is. Regards Ma?lle Sa?ag saim at teamlog.com