It seems like having secretaries or assistants has become a luxury over time, and is gone for many people. If companies would have them, and the employees give

It seems like having secretaries or assistants has become a luxury over time, and is gone for many people. If companies would have them, and the employees give those numbers for emergencies as well as client calls, then it would provide a barrier that could potentially address routine calls that need a call back (or not) vs. emergency calls that need urgent attention. That would seem courteous to those who call as well, having someone talk to them and tell them that their message would be conveyed. With smartphones, the option available is to have everyone put their phones on Do Not Disturb mode (hopefully that's available for everyone) and keep all the phones in silent/vibrate mode in a corner in the meeting room. On IOS, further configuration is possible for favorite contacts and repeated calls to get through. But this solution is still grossly inadequate by itself.