Same here, call on 5/2 (Sat) at work, just the sound of a hang up on my voicemail. Many coworkers received the same. If you call back you get a message that the number you have dialed is not accepting incoming calls.
I received a hang-up at 9:30 PM last night and then a call this morning at 10:00 AM. The person on the other end immediately sounded suspicious, she didn't know my name, only my extension. The caller requested that I go to the printer nearest me and provide her with the printer number. I obviously denied her request and asked her who she was calling on behalf of. She refused to provide me with the information, however still insisted on the printer number. I then asked for a number to call her back at and she terminated the call.
After a bit of research, it was obvious that this is a SCAM. Apparently after the caller gets the printer number, your company will receive multiple boxes of toner and a bill...all of course unsolicited.