I?m trying compiling python_pjsua project using VS2005 with PSDK 2003 SP1, but link errors occurs. All anothers libraries was sucessful compiled. Follow below. ------ Build started: Project: python_pjsua, Configuration: Release Win32 ------ Linking... Creating library .\output\python_pjsua-i386-win32-vc6-release/_pjsua.lib and object .\output\python_pjsua-i386-win32-vc6-release/_pjsua.exp pjsua-lib-i386-win32-vc6-release.lib(pjsua_media.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_dev_get_info referenced in function _pjsua_enum_aud_devs pjmedia-i386-win32-vc6-release.lib(conference.obj) : error LNK2001: unresolved external symbol _pjmedia_aud_dev_get_info pjmedia-i386-win32-vc6-release.lib(sound_port.obj) : error LNK2001: unresolved external symbol _pjmedia_aud_dev_get_info pjsua-lib-i386-win32-vc6-release.lib(pjsua_media.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_dev_count referenced in function _pjsua_enum_aud_devs pjsua-lib-i386-win32-vc6-release.lib(pjsua_media.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_dev_default_param referenced in function _create_aud_param pjmedia-i386-win32-vc6-release.lib(sound_port.obj) : error LNK2001: unresolved external symbol _pjmedia_aud_dev_default_param pjsua-lib-i386-win32-vc6-release.lib(pjsua_media.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_stream_get_param referenced in function _update_initial_aud_param pjmedia-i386-win32-vc6-release.lib(conference.obj) : error LNK2001: unresolved external symbol _pjmedia_aud_stream_get_param pjmedia-i386-win32-vc6-release.lib(sound_port.obj) : error LNK2001: unresolved external symbol _pjmedia_aud_stream_get_param pjsua-lib-i386-win32-vc6-release.lib(pjsua_media.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_param_set_cap referenced in function _pjsua_snd_set_setting pjsua-lib-i386-win32-vc6-release.lib(pjsua_media.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_stream_set_cap referenced in function _pjsua_snd_set_setting pjmedia-i386-win32-vc6-release.lib(sound_port.obj) : error LNK2001: unresolved external symbol _pjmedia_aud_stream_set_cap pjsua-lib-i386-win32-vc6-release.lib(pjsua_media.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_param_get_cap referenced in function _pjsua_snd_get_setting pjsua-lib-i386-win32-vc6-release.lib(pjsua_media.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_stream_get_cap referenced in function _pjsua_snd_get_setting pjmedia-i386-win32-vc6-release.lib(sound_port.obj) : error LNK2001: unresolved external symbol _pjmedia_aud_stream_get_cap pjmedia-i386-win32-vc6-release.lib(endpoint.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_subsys_shutdown referenced in function _pjmedia_endpt_destroy pjmedia-i386-win32-vc6-release.lib(endpoint.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_subsys_init referenced in function _pjmedia_endpt_create pjmedia-i386-win32-vc6-release.lib(sound_port.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_stream_destroy referenced in function _stop_sound_device pjmedia-i386-win32-vc6-release.lib(sound_port.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_stream_stop referenced in function _stop_sound_device pjmedia-i386-win32-vc6-release.lib(sound_port.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_stream_start referenced in function _start_sound_device pjmedia-i386-win32-vc6-release.lib(sound_port.obj) : error LNK2019: unresolved external symbol _pjmedia_aud_stream_create referenced in function _start_sound_device pjlib-i386-win32-vc6-release.lib(guid_win32.obj) : error LNK2019: unresolved external symbol __imp__CoCreateGuid at 4 referenced in function _pj_generate_unique_string ..\lib\_pjsua.pyd : fatal error LNK1120: 15 unresolved externals What?s wrong ? Thanks all.