Hi, I have a a-low hardware codec together with a WinCE uP. Therefore I want to use PJSIP with a passthrough CODEC. in the file config_site.h I have set the following: #define PJMEDIA_HAS_PASSTHROUGH_CODECS 1 #define PJMEDIA_HAS_L16_CODEC 0 #define PJMEDIA_HAS_ILBC_CODEC 0 #define PJMEDIA_HAS_GSM_CODEC 0 #define PJMEDIA_HAS_SPEEX_CODEC 0 #define PJMEDIA_HAS_G722_CODEC 0 #define PJMEDIA_HAS_PASSTHROUGH_CODEC_G729 0 #define PJMEDIA_HAS_PASSTHROUGH_CODEC_ILBC 0 #define PJMEDIA_HAS_PASSTHROUGH_CODEC_PCMA 0 When I make a call to SJphone, and PJMEDIA_HAS_PASSTHROUGH_CODECS is set to 1, SJphone says that there is CODEC error, but when PJMEDIA_HAS_PASSTHROUGH_CODECS is set to 0 the sip call go through. How can I fix this? Best regards Kresten