How to sound professional on the phone?

If the person who is being asked for does not want to be disturbed, but the call is important, you should:

How should you acknowledge a customer when you're asking them to verify information?

Generating interest by the way you raise or lower your voice describes which of the following communication skills?

You have a customer standing at your desk while your phone begins ringing. You...

A customer walks in to your office while you are on the phone with a personal matter.

If finding a solution to a problem is taking longer than expected, what should you do?

When you are angry with someone on the phone you should:

Should you check back with a customer if you are keeping them on mute/hold while researching an issue that is taking longer than expected?

Before hanging up the phone:

After being asked the same question by the 5th customer, what do you do?