Hi all, I have tried to recompile the PJSIP again and it seems that during the compile time, the "iphonesound.c" file was not being compiled. Do anyone have any idea how should I modify to make the compilation work? As mention before, I have followed the Wiki at Siphon Google Code page, and did all the step on it, still it didn't compile the iphonesound.c file. Thanks in advance. Jin Li Chee