/*
         * Now drop voice frames past the limit, currently 2 voice frames.
         */

        if (vqlen > 2) {
                AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->readq, cur, frame_list) {
                        if (cur->frametype == AST_FRAME_VOICE) {
                                AST_LIST_REMOVE_CURRENT(&chan->readq, frame_list);
                                ast_frfree(cur);
                                vqlen--;
                                if (vqlen <= 2)
                                        break;
                        }
                }
                AST_LIST_TRAVERSE_SAFE_END;
        }

        /* See if the last frame on the queue is a hangup, if so don't queue anything */
        if ((cur = AST_LIST_LAST(&chan->readq)) && (cur->frametype == AST_FRAME_CONTROL) && (cur->subclass == AST_CONTROL_HANGUP)) {
                ast_frfree(f);
                ast_channel_unlock(chan);
                return 0;
        }

        /* Count how many frames exist on the queue */
        AST_LIST_TRAVERSE(&chan->readq, cur, frame_list) {
                qlen++;
        }

        /* Allow up to 96 voice frames outstanding, and up to 128 total frames */
        if (((fin->frametype == AST_FRAME_VOICE) && (qlen > 96)) || (qlen  > 128)) {
                if (fin->frametype != AST_FRAME_VOICE) {
                        ast_log(LOG_WARNING, "Exceptionally long queue length queuing to %s\n", chan->name);
                        CRASH;
                } else {
                        if (option_debug)
                                ast_log(LOG_DEBUG, "Dropping voice to exceptionally long queue on %s\n", chan->name);
                        ast_frfree(f);
                        ast_channel_unlock(chan);
                        return 0;
                }
        }