Leave your phone number if you're leaving a message!
I was woken this morning at about 0230 by a fellow from one of our offices in California calling my extension (which is redirected to a mobile so I can more easily work remote from an office).
I got to the phone after the call diverted to voicemail, and figured I should listen to it. (I thought it could have been my mother calling regarding the state of my grandmother's ailing health).
The caller did not clearly identify himself. He didn't leave a phone number to call him at, just referred to an email he said he'd sent me a few days ago which was now critical. He didn't really say what actually was critical though, so I was left with a meta-phone message.
There I was, wide awake when I should be sleeping, and I had no way of finding out who it was who'd called me, or what he was referring to.
This morning I checked my inbox --- there was an RFE update relating to a utility I maintain. It's not "critical" it's merely an issue with the c-style used in the code. Fixing this RFE won't change any functionality, just the way that the code gets printed. Oh, and there was nothing from this bloke in my inbox apart from the RFE update. So much for it being a "critical" issue!
So please, if you're going to leave a voicemail for somebody, make darned sure you say exactly who you are and how to get in contact with you. Otherwise you'll wind up not getting a phone call back.