Hi I am using pjproject 2.9 and OpenSSL 1.0.2h. SRTP works but I also need AES-GCM support. So I defined the following lines in the config.h but during the compilation I got an linker error. #define PJMEDIA_SRTP_HAS_AES_GCM_256 1 pjproject/2.9-r2/2.9/pjmedia/lib/libpjmedia.so: undefined reference to `srtp_aes_gcm_256_openssl'. I checked with "openssl enc -help 2>&1 | grep gcm" on my device that my openssl version supports aes_gcm. Is there any configuration missing? Best regards Harald