Mine

 chan = ast_request(type, format, data, &cause);
        if (chan) {
                if (oh) {
                        ast_set_variables(chan, oh->vars);
                        ast_set_callerid(chan, oh->cid_num, oh->cid_name, oh->cid_num);
                }
                ast_set_callerid(chan, cid_num, cid_name, cid_num);

                if (!ast_call(chan, data, 0)) {
                        while(timeout && (chan->_state != AST_STATE_UP)) {
                                res = ast_waitfor(chan, timeout);
                                if (res < 0) {
                                        /* Something not cool, or timed out */
                                        break;
                                }
                                /* If done, break out */
                                if (!res)
                                        break;
                                if (timeout > -1)
                                        timeout = res;
                                f = ast_read(chan);
                                if (!f) {
                                        state = AST_CONTROL_HANGUP;
                                        res = 0;
                                        break;
                                }
                                if (f->frametype == AST_FRAME_CONTROL) {
                                        if (f->subclass == AST_CONTROL_RINGING)
                                                state = AST_CONTROL_RINGING;
                                        else if ((f->subclass == AST_CONTROL_BUSY) || (f->subclass == AST_CONTROL_CONGESTION)) {
                                                state = f->subclass;
                                                ast_frfree(f);
                                                break;
                                        } else if (f->subclass == AST_CONTROL_ANSWER) {
                                                state = f->subclass;
                                                ast_frfree(f);
                                                break;
                                        } else if (f->subclass == AST_CONTROL_PROGRESS) {
                                                /* Ignore */
                                        } else if (f->subclass == -1) {
                                                /* Ignore -- just stopping indications */
                                        } else {
                                                ast_log(LOG_NOTICE, "Don't know what to do with control frame %d\n", f->subclass);
                                        }
                                }
                                ast_frfree(f);