Hi Benny, I can't figure out what is wrong with my project files as I created a fresh new project an hour ago and checked out for the latest version. below is the output: 1>------ Skipped Build: Project: libgsmcodec, Configuration: Debug Win32 ------ 1>Project not selected to build for this solution configuration 2>------ Skipped Build: Project: libsrtp, Configuration: Debug Win32 ------ 2>Project not selected to build for this solution configuration 3>------ Skipped Build: Project: libspeex, Configuration: Debug Win32 ------ 3>Project not selected to build for this solution configuration 4>------ Skipped Build: Project: libresample, Configuration: Debug Win32 ------ 4>Project not selected to build for this solution configuration 5>------ Skipped Build: Project: libportaudio, Configuration: Debug Win32 ------ 5>Project not selected to build for this solution configuration 6>------ Skipped Build: Project: libmilenage, Configuration: Debug Win32 ------ 6>Project not selected to build for this solution configuration 7>------ Skipped Build: Project: libilbccodec, Configuration: Debug Win32 ------ 7>Project not selected to build for this solution configuration 8>------ Build started: Project: pjsua_wince, Configuration: Debug Windows Mobile 5.0 Pocket PC SDK (ARMV4I) ------ 8>Linking... 8>pjmedia_wince.lib(transport_srtp.obj) : error LNK2019: unresolved external symbol srtp_init referenced in function pjmedia_srtp_init_lib 8>pjmedia_wince.lib(transport_srtp.obj) : error LNK2019: unresolved external symbol octet_string_hex_string referenced in function pjmedia_transport_srtp_start 8>pjmedia_wince.lib(transport_srtp.obj) : error LNK2019: unresolved external symbol srtp_dealloc referenced in function pjmedia_transport_srtp_start 8>pjmedia_wince.lib(transport_srtp.obj) : error LNK2019: unresolved external symbol srtp_create referenced in function pjmedia_transport_srtp_start 8>pjmedia_wince.lib(transport_srtp.obj) : error LNK2019: unresolved external symbol srtp_protect referenced in function transport_send_rtp 8>pjmedia_wince.lib(transport_srtp.obj) : error LNK2019: unresolved external symbol srtp_protect_rtcp referenced in function transport_send_rtcp 8>pjmedia_wince.lib(transport_srtp.obj) : error LNK2019: unresolved external symbol srtp_unprotect referenced in function srtp_rtp_cb 8>pjmedia_wince.lib(transport_srtp.obj) : error LNK2019: unresolved external symbol srtp_unprotect_rtcp referenced in function srtp_rtcp_cb 8>pjmedia_wince.lib(transport_srtp.obj) : error LNK2019: unresolved external symbol crypto_get_random referenced in function generate_crypto_attr_value 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_GetHostApiCount referenced in function pjmedia_snd_init 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_Initialize referenced in function pjmedia_snd_init 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol PaUtil_SetDebugPrintFunction referenced in function pjmedia_snd_init 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_GetDeviceCount referenced in function pjmedia_snd_get_dev_count 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_GetDeviceInfo referenced in function pjmedia_snd_get_dev_info 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_GetStreamInfo referenced in function pjmedia_snd_open_rec 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_OpenStream referenced in function pjmedia_snd_open_rec 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_GetHostApiInfo referenced in function pjmedia_snd_open_rec 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_CloseStream referenced in function pjmedia_snd_open 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_StopStream referenced in function pjmedia_snd_stream_start 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_StartStream referenced in function pjmedia_snd_stream_start 8>pjmedia_wince.lib(pasound.obj) : error LNK2019: unresolved external symbol Pa_Terminate referenced in function pjmedia_snd_deinit 8>pjmedia_wince.lib(errno.obj) : error LNK2019: unresolved external symbol Pa_GetErrorText referenced in function pjmedia_strerror 8>pjmedia_wince.lib(resample_resample.obj) : error LNK2019: unresolved external symbol res_GetXOFF referenced in function pjmedia_resample_create 8>pjmedia_wince.lib(resample_resample.obj) : error LNK2019: unresolved external symbol res_SrcLinear referenced in function pjmedia_resample_run 8>pjmedia_wince.lib(resample_resample.obj) : error LNK2019: unresolved external symbol res_Resample referenced in function pjmedia_resample_run 8>pjmedia_wince.lib(echo_speex.obj) : error LNK2019: unresolved external symbol speex_preprocess_state_destroy referenced in function speex_aec_create 8>pjmedia_wince.lib(echo_speex.obj) : error LNK2019: unresolved external symbol speex_preprocess_ctl referenced in function speex_aec_create 8>pjmedia_wince.lib(echo_speex.obj) : error LNK2019: unresolved external symbol speex_echo_state_destroy referenced in function speex_aec_create 8>pjmedia_wince.lib(echo_speex.obj) : error LNK2019: unresolved external symbol speex_preprocess_state_init referenced in function speex_aec_create 8>pjmedia_wince.lib(echo_speex.obj) : error LNK2019: unresolved external symbol speex_echo_ctl referenced in function speex_aec_create 8>pjmedia_wince.lib(echo_speex.obj) : error LNK2019: unresolved external symbol speex_echo_state_init referenced in function speex_aec_create 8>pjmedia_wince.lib(echo_speex.obj) : error LNK2019: unresolved external symbol speex_echo_state_reset referenced in function speex_aec_capture 8>pjmedia_wince.lib(echo_speex.obj) : error LNK2019: unresolved external symbol speex_preprocess_run referenced in function speex_aec_cancel_echo 8>pjmedia_wince.lib(echo_speex.obj) : error LNK2019: unresolved external symbol speex_echo_cancellation referenced in function speex_aec_cancel_echo 8>pjmedia_codec_wince.lib(gsm.obj) : error LNK2019: unresolved external symbol gsm_create referenced in function gsm_codec_open 8>pjmedia_codec_wince.lib(gsm.obj) : error LNK2019: unresolved external symbol gsm_destroy referenced in function gsm_codec_close 8>pjmedia_codec_wince.lib(gsm.obj) : error LNK2019: unresolved external symbol gsm_encode referenced in function gsm_codec_encode 8>pjmedia_codec_wince.lib(gsm.obj) : error LNK2019: unresolved external symbol gsm_decode referenced in function gsm_codec_decode 8>pjmedia_codec_wince.lib(ilbc.obj) : error LNK2019: unresolved external symbol initDecode referenced in function ilbc_codec_open 8>pjmedia_codec_wince.lib(ilbc.obj) : error LNK2019: unresolved external symbol initEncode referenced in function ilbc_codec_open 8>pjmedia_codec_wince.lib(ilbc.obj) : error LNK2019: unresolved external symbol iLBC_encode referenced in function ilbc_codec_encode 8>pjmedia_codec_wince.lib(ilbc.obj) : error LNK2019: unresolved external symbol iLBC_decode referenced in function ilbc_codec_decode 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2001: unresolved external symbol speex_uwb_mode 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2001: unresolved external symbol speex_wb_mode 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2001: unresolved external symbol speex_nb_mode 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_encoder_destroy referenced in function get_speex_info 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_encoder_ctl referenced in function get_speex_info 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_encoder_init referenced in function get_speex_info 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_decoder_ctl referenced in function spx_codec_open 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_decoder_init referenced in function spx_codec_open 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_bits_init referenced in function spx_codec_open 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_decoder_destroy referenced in function spx_codec_close 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_bits_destroy referenced in function spx_codec_close 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_bits_write referenced in function spx_codec_encode 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_bits_nbytes referenced in function spx_codec_encode 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_encode_int referenced in function spx_codec_encode 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_bits_reset referenced in function spx_codec_encode 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_decode_int referenced in function spx_codec_decode 8>pjmedia_codec_wince.lib(speex_codec.obj) : error LNK2019: unresolved external symbol speex_bits_read_from referenced in function spx_codec_decode 8>Windows Mobile 5.0 Pocket PC SDK (ARMV4I)\Debug/pjsua_wince.exe : fatal error LNK1120: 59 unresolved externals 8>Build log was saved at "file://c:\SSRoot\pjproject4\pjsip-apps\src\pjsua_wince\Windows Mobile 5.0 Pocket PC SDK (ARMV4I)\Debug\BuildLog.htm" 8>pjsua_wince - 60 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 9 up-to-date, 7 skipped ==========