When my girls worked for me, they quickly learned to identify themselves immediately - because the three of us are utterly interchangeable on the phone. They would answer, and people would instantly launch into their complicated questions only to be told, "You'll have to talk to mom; hang on she's coming."
The flip side is when older daughter had her first job, they handed out the W2s in January. Her response was, "great; thanks!" and the other kids were asking "what is this and what do I do with it?" She started explaining and next thing she knew, she had the entire shop surrounding her as she explained the data fields and where the information went on the federal and state forms. She told me later, "As I was talking, I was thinking to myself 'I sound just like mom...'"