Woman with an accent wanted to speak with the head of Corporate Communications about -- what else? -- Corp Comm matters (she had his name right).  I explained that executive's calls are screened here and requested more information.  She politely stated that she'd find another way to contact him, so I said that I'd transfer her and did -- right to Purchasing.  Researched this number and located a firm named Marcus Evans that runs global strategic conferences and corporate marketing events.  How professional is a company that tries to make end runs around the screening process?  Not very.

Received two calls from a man identifying himself as Dean Wallace. Both times asking for top executives in our office and their where abouts. I explained that I am not allowed to divulge that information and continued to ask for the name of the company he is associated with. At first he did not want to give that out....suspicious, after I explained that I would have to disconnect the call without further information he stated that he worked with ME Energy Group and would not divulge any additional information.
I then googled the name of the company as well as reverse phone look up.
My execs do not want to speak to this person.

Women called for CEO I stated this was marketing office stated she could only talk to him explained that was not going to happen, was very rude and unprofessional, she said she was calling on conferences for healthcare form another country

Woman identifying herself as Sandra called our breakroom phone (not listed) and asked for a name I didn't know; I offered to look them up and she said they were the head of the a group I work with in the NY office (I would have heard of them).  When I asked her where she was calling from she answered "Toronto" (really?) and when I pressed for more info she identified the company as "ME Toronto".  I searched the phone number and found enough info on the company to realize she was a marketer fishing for executives, so I left her on hold indefinitely.

a man from "Chevron" called my office asking for a specific person. "is this *employee*'s office?" I told him he wasn't in and I can grab his info and forward it to him and he said no that's fine I have his cell phone. reading everyone else's posts, it seems weird that this number was used from different companies.