Speak directly into the mouthpiece. If this is a problem because you use other equipment while on the telephone (i.e., computer), consider purchasing a headset, which will free your hands.
Do not eat or chew gum while talking on the telephone (your caller may ask what you’re having for lunch!!)
If someone walks into your office while you’re talking on the telephone, ask the caller if you may put him/her on hold briefly). Depress the HOLD button.
Don't place the handset in the cradle until you’ve depressed the HOLD button.
Don’t lay the receiver on the desk, without placing the caller on hold (the caller will hear everything being discussed in your office).
Return to caller and complete the call as soon as possible.