rr_next          1570 src/ftdm_io.c  		i = rr_next(group->last_used_index, 0, group->chan_count - 1, direction);
rr_next          1602 src/ftdm_io.c  			i = rr_next(i, 0, group->chan_count - 1, direction);
rr_next          1693 src/ftdm_io.c  		i = rr_next(span->last_used_index, 1, span->chan_count, direction);
rr_next          1735 src/ftdm_io.c  			i = rr_next(i, 1, span->chan_count, direction);