// This code works well
char uniqueid[256];
char *tmp = NULL;
ast_cdr_getvar(chan->cdr, "uniqueid",&tmp, uniqueid,sizeof(uniqueid), 0);
ast_log(LOG_DEBUG, "UNIQUEID: '%s'\n",uniqueid);


// This code prints out all variable defined for current channel
printf("\n\nDUMPING VARIABLES\n");
struct ast_var_t *variables;
struct varshead *headp;
headp=&chan->varshead;
AST_LIST_TRAVERSE(headp,variables,entries) {
        printf("%s -> %s\n", ast_var_name(variables),ast_var_value(variables));
}

// This code doesn't print anything at all, why?
// I wan't to print all variables from CDR
printf("DUMPING CDR VARIABLES:\n");
headp = &(chan->cdr)->varshead;
AST_LIST_TRAVERSE(headp, variables, entries) {
      printf("%s -> %s\n", ast_var_name(variables), ast_var_value(variables));
}
printf("\n\n");