Those high pitched screeches are AWFUL aren't they? They really grate on me.
DS is in his third phase of high pitched screeching (surely one was enough?). My tips are talk and sing as much as you can to your DD so there are fewer gaps for her to fill with screeches, some thing like old macdonald had a farm is a good one as it can be almost endless and doesn't take up much of your brain power leaving you almost completely free do get on with housework. Once you run out of real farm animals you can fill it with any other animal, or objects that make noise.
I also ask DS to 'speak' rather than scream and then demonstrate with some babble sounds that I know he can already do, and if/when he makes those sounds I encourage it a lot by echoing back and keeping up communication.
I know communication doesn't solve the entire problem, but hope this might help a bit.
I also have a busy box in each room, so there are a few things to play with before he gets the chance to screech. At that age (and beyond) anything new or different will fulfil the need for a few or more minutes, safe food packaging, cookie cutters, washed out soap bottles (without choke hazard lids), all sorts that would other wise go in the bin or for recycling.