Having a conference call that is distorted or interrupted by static or other line noise is tantamount to having your conversation interrupted. This breaks the train of thought for many participants, which leads to a less effective conference call. Using a landline rather than VoIP or mobile telephones will help with line noise. Background noise is often even worse.
Utilize 1* to mute all conference attendees and 4* to have attendees mute and un-mute themselves during a call if 1* has not be enabled. Use a land line, avoid using speaker phone and use a good quality headset, these tips will decrease the chances of the call being dropped along with making sure that the sound is crisp and clear. To ensure that there is minimal background noise and echo, make sure you are in a quiet place and that the room has carpeting to muffle any outside noise.