Phantom calls

First I've been back here for a year or so, it seems to have disappeared... Any ways, looking at my call history that I monitor daily, I often see multiple numbers as having been dialed from here, within seconds or simultaneously, with a duration of 0 seconds. I wonder if my number is being used by spammers.
Also, unrelated, but my caller ID only works on my Panasonic phones about half the time. Any ideas?