Hi everyone, I am new to pjsip and trying to make my first test app, but it seems I am missing some functions I think should be in he pjmedia library. Here is the output from my make command: g++ -m64 -o SIPTester main.o tester.o moc_tester.o -L/usr/X11R6/lib64 `pkg-config --libs libpjproject` -lQt5Widgets -L/usr/lib/x86_64-linux-gnu -lQt5Gui -lQt5Core -lGL -lpthread /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_destroy': sound_port.c:(.text+0x2c6): undefined reference to `pjmedia_aud_stream_stop' sound_port.c:(.text+0x2d2): undefined reference to `pjmedia_aud_stream_destroy' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_set_ec': sound_port.c:(.text+0x3c2): undefined reference to `pjmedia_aud_stream_get_param' sound_port.c:(.text+0x4c2): undefined reference to `pjmedia_aud_stream_get_cap' sound_port.c:(.text+0x507): undefined reference to `pjmedia_aud_stream_set_cap' sound_port.c:(.text+0x578): undefined reference to `pjmedia_aud_stream_set_cap' sound_port.c:(.text+0x5b0): undefined reference to `pjmedia_aud_stream_set_cap' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `start_sound_device': sound_port.c:(.text+0x711): undefined reference to `pjmedia_aud_stream_create' sound_port.c:(.text+0x77e): undefined reference to `pjmedia_aud_stream_destroy' sound_port.c:(.text+0x7ad): undefined reference to `pjmedia_aud_stream_start' sound_port.c:(.text+0x7e1): undefined reference to `pjmedia_aud_dev_get_info' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_create': sound_port.c:(.text+0xa2c): undefined reference to `pjmedia_aud_dev_default_param' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_create_rec': sound_port.c:(.text+0xadc): undefined reference to `pjmedia_aud_dev_default_param' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_create_player': sound_port.c:(.text+0xb8c): undefined reference to `pjmedia_aud_dev_default_param' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_get_ec_tail': sound_port.c:(.text+0xc72): undefined reference to `pjmedia_aud_stream_get_cap' sound_port.c:(.text+0xcc0): undefined reference to `pjmedia_aud_stream_get_cap' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(endpoint.o): In function `pjmedia_endpt_create': endpoint.c:(.text+0x132): undefined reference to `pjmedia_aud_subsys_init' endpoint.c:(.text+0x1a3): undefined reference to `pjmedia_aud_subsys_shutdown' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(endpoint.o): In function `pjmedia_endpt_destroy': endpoint.c:(.text+0x4eb): undefined reference to `pjmedia_aud_subsys_shutdown' collect2: error: ld returned 1 exit status make: *** [SIPTester] Error 1 I followed the instruction for the build of pjsip and made sure I had all the dependencies installed first. But I am still getting these errors. Can anybody tell me what I am missing? Thanks, Neil Cherry