Hi pjsip list members I was using streamutil on pjsip 1.16 version fine. Ubuntu 64 bits But with 2.1 version I'm getting this error running streamutil: 22:51:29.305 os_core_unix.c !pjlib 2.1-svn for POSIX initialized 22:51:50.296 pa_dev.c PortAudio sound library initialized, status=0 22:51:50.296 pa_dev.c PortAudio host api count=2 22:51:50.296 pa_dev.c Sound device count=9 22:51:50.297 pjlib select() I/O Queue created (0x738f58) streamutil: ../src/pjmedia/codec.c:53: pjmedia_codec_param_clone: Assertion `pool && src' failed. Abortado (`core' generado) Also have test NULL audio without success: 22:29:33.792 pa_dev.c PortAudio sound library initialized, status=0 22:29:33.792 pa_dev.c PortAudio host api count=2 22:29:33.792 pa_dev.c Sound device count=9 22:29:33.792 null_dev.c null audio initialized 22:29:33.792 pjlib select() I/O Queue created (0x2485f58) streamutil: ../src/pjmedia/codec.c:53: pjmedia_codec_param_clone: Assertion `pool && src' failed. Abortado (`core' generado) Please, some advise on this issue? cheers sergios