A number of faculty and teachers have been using PhoneDynamo.com to manage their own personal and professional profiles.
Faculty & Teachers
Be accessible to students and protect your security.
Know when a student is calling you.
Control when students can call you.
Customize recorded messages to students.
2nd phone number that calls your current phone number.
Separate voice mail with each phone number.
Add a phone number for consulting and professional engagements any time.
Phone Dynamo 
It does seem that everybody is into this kind of stuff lately. Don’t really understand it though, but thanks for trying to explain it. Appreciate you shedding light into this matter. Keep it up