yes I do understand. Keep in mind this is someone I've never talked to before, they call me during working hours and have some expectation that I will answer and when I don't they just decide rather than leave a message and call back a day or two later they are just going to keep childishly calling me back, interrupting my work in the process. I can understand if its someone with whom I've already had contact and I agreed to make myself available but only a salesperson / recruiter would actually believe that I am the one being rude.