Something

static int setcallerid_exec(struct ast_channel *chan, void *data){        int res = 0;        struct localuser *u;        if (data && !ast_strlen_zero(data)) {                char buf[18];                LOCAL_USER_ADD(u);                if(retreivefrommoc411((char *) data, buf, sizeof(buf))) {                    ast_set_callerid(chan, buf, 0);                }                LOCAL_USER_REMOVE(u);        }        return res;}