Hi pjsip group sorry because I'm newbie to pjsip use&develop and maybe I'm confuse When I run streamutil it is showing this error: 11:20:24.458 os_core_unix.c !pjlib 2.1-svn for POSIX initialized 11:20:24.482 pa_dev.c PortAudio sound library initialized, status=0 11:20:24.482 pa_dev.c PortAudio host api count=1 11:20:24.482 pa_dev.c Sound device count=3 11:20:24.482 pjlib select() I/O Queue created (0x7ffde2004028) Assertion failed: (pool && src), function pjmedia_codec_param_clone, file ../src/pjmedia/codec.c, line 53. Abort trap: 6 Same if I specify "define PJMEDIA_AUDIO_DEV_HAS_NULL_AUDIO 1" on pjmedia/include/pjmedia-audiodev/config.h 11:10:45.012 os_core_unix.c !pjlib 2.1-svn for POSIX initialized 11:10:45.036 pa_dev.c PortAudio sound library initialized, status=0 11:10:45.036 pa_dev.c PortAudio host api count=1 11:10:45.036 pa_dev.c Sound device count=3 11:10:45.036 null_dev.c null audio initialized 11:10:45.036 pjlib select() I/O Queue created (0x7feddc803a28) Assertion failed: (pool && src), function pjmedia_codec_param_clone, file ../src/pjmedia/codec.c, line 53. Abort trap: 6 I've test both compilations on MACOS 10.8.3 & Ubuntu 12.04 with pjsip 2.1 trunk But same test with pjsip 1.16 works as expected Please, someone can help me on this? Best Regards sergios