Good conference call etiquette requires not only that, as a participant, you comport yourself in the discussion in a professional manner, but also that you show you're a pro by not being the cause of any unnecessary hardware disruptions. You can always control your own behavior, but what about that of the equipment you're using?
In terms of hardware, there are always going to be things that are out of your control. You may not always be able to be alone in a nice quiet office with the door closed, you might have to be on travel, your phone might be on the fritz, or you might be in a large group clustered around a speakerphone.
Whatever the case, with some thought and knowing what the most likely problems are, you can minimize a lot of the distractions on a conference call that come from what you're using, as opposed to what you're saying or how you're saying it. Below are two things to keep in mind for your next teleconference.
If at all possible use a telephone with a land line, not a cordless phone, cell phone, or computer telephony (i.e., a phone that used Voice Over IP). The reason for this is that a land-line telephone has the highest quality sound with the least amount of static, cutting in and out, latency, jitter, echo, or other issues that degrade voice quality and the ability of others on the call to understand you. You can't leave a good impression if your phone is the one causing a lot of technical problems for the group.
If you get a bad connection, tell the host you're going to hang up and call in again to see if you can get a better connection. Nine times out of ten, this corrects any problems. Nothing is more annoying or distracting than to be stuck in an hour long teleconference when one person's phone is generating a lot of static or when there is an echo every time you speak.