Regarding Wilson Boyrie’s response:
I have verified that this source of these calls has nothing to do with my PBX. The calls are not originating here nor are they passing through our PBX.
I think that I have figured out the data source–someone is using our website as a base and then following the links to the associates’ own sites to get the phone numbers.
The question remaining is–what type of technology is being used. It appears as though the calls are coming from a personal residence. Are there hosted IP services that would provide (purposefully or incidentally) a conference calling or three way calling service? How difficult would it be to spoof this residence number? In other words–how confident can I be that the number being traced is really the number…???