Sound problem when video camera is turned on

Question

I just purchased a phillips SPC525NC webcam and installed it yesterday. I also did an install with SKYPE. I had another SKYPE user call me and we could converse with no problems. I could receive her video transmission and still converse. However when I turned on my video camera she advised me that she could no longer hear me clearly/ or had completely lost voice communication with me although I could still hear her clearly. Can you please advise how to fix the problem in order for her to see me and hear me clearly.

Thank you for your assistance