> Leave as quietly as possible and wait until you???re out of the room before answering.

Well, not exactly. MORE annoying is doing the above recommended procedure, as opposed to simply opening the phone immediately in order to silence the usually too loud/cute ringer and then exiting the room before engaging in the call. More often than not, it is the cute ringer that the phone owner wants everyone to hear and that they are so important that they have to be reached, no matter what they are doing or where they may be.