When you spend all day calling people how much time you spend on gate keepers? How often do you have to explain yourself at their first line of defense (the reception)? When calling with blocked or withheld number, you give the impression of calling from a call center. There is a reason you don‘t show the number, as you are afraid to be recognized as a sales person. You announce being a sales person.
Important people use mobile phones for business reasons. A telesales executive usually does not. You could be any client or business partner.

just knowing the words you say on the telephone when prospecting new clients may not be enough to succeed. Tone & voice are more important than anything in your pitch. The portrayed vision of yourself is not compelling enough, to get your message across.

The key element and certainly necessary to get ahead in the sales process, is to reach the decision maker. A decision maker is a person who can say yes, even though everyone else said no. A decision maker can overrule anybody. That‘s the person you should be aiming for.
Depending on the size and structure of the company, these decision makers are very senior executives. It does not need to be the CEO, as it clearly depends on the value and size of the proposal.
In 99% of all senior executives, true decision maker has an assistant or secretary. If they don‘t, it is safe to suggest to re-evaluate that you are really speaking to the decision maker. While assistants are a clear indicator that we are about to speak to someone who is in a higher command of the prospects‘s company, it is also a pain and a barrier.