It's not often I say mine are well behaved, but it sounds like I'm lucky, especially since we made a shelter (literaly like a giant table) I turn them out in the morning and tend to forget they are there (yes I do check on them) but never hear them, they just come and stand by the gate in the evening, no noise.
when inside if they are hungry they will bleat when I go in, but I try and keep hay in the racks.
There again I think Toggs are very placid up to some breeds, and I don't go out every time if I do hear them calling, just a sneaky look out of a window or round a corner, they would soon learn how to get 'mums' attention, and what's more fun than keep having 'mum' running out to attend your every whim?