No message on answering machine and unavailable on caller ID red flag: SCAM

Just received call.  Said hello twice and was hung up on.  Called back immediately and it says "press 1 to be connected " , which I did,  only to EVENTUALLY get a voicemail saying "this is attorney Jim Johnson ".  Not sure if collection agency or scam, as one would think an attorney's number would be an easy reverse search on Google.