Telephone etiquette and manners...not necessary?

First of all, I think it is necessary, and should be mandatory, especially if you are a professional, calling another professional. I could have 10 sets of fingers AND toes and not have enough to count on them how many times I am interrupted when I am answering the phone and announcing my business. I do not go on and on and on... I simply say "Good Morning (fake name) Smith and associates, this is Michelle, how may I help you?" Siriusly, how long does that take? 5 seconds? But people feel the need to interrupt me and not even with an excuse me, just "John please" Maybe I am too strict about things like this, but it annoys me to no end and it makes me want to not do business with your company. I see this in some of the sales people who work with my boss (Certified Financial Planner) they are extremely nice, polite, and helpful to him...but its how they treat the peons (me...LOL) that shows me what type of a person they are and if their business is worth investing in. Good thing for me is my boss listens to his peons and will take rudeness to staff as a consideration on doing business with that person/company.
Sorry any loyal readers I may have to bore you with this...its a pet peeve of mine and I feel better getting it off my chest... now back to work for me!