Caller sounds legit...makes it sound like they are calling from one of my clients ...usually call comes in after hours and wants emergency call back. Sounds very angry..don't recognize the voice but hey its a client. It puts the whole urgent paging process through it's paces...I call the number given...either rings a very busy busy tone...like phone is out of service...or other times an automated voice says number doesn't exist. This type of call has come in from other numbers from other area codes. Have no idea the reasoning behind it.