int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles);
int SSL_set_tlsext_use_srtp(SSL *ctx, const char *profiles);
SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s);
int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles);
int SSL_set_tlsext_use_srtp(SSL *ctx, const char *profiles);
SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s);