What is excessive vocalisation?
This is a difficult question to answer. Some breeds of cat are more talkative than others. The Siamese and Bengal breeds are both well-known talkers. We share our home with a domestic shorthair cat who is a constant chirper she had already been named Melody when we adopted her.
It also depends on the pet owner’s tolerance. Some pet owners enjoy a chatty cat; others prefer a quieter cat.