Yeah, its been a while. Unfortunately I can't use it because the lines at work won't allow wi-fi calls. Not much good if I can't call the office or they can't call me.
Are you saying that if (a) your employer calls you, and (b) you happen to be connected to VZW's system via standard IP (wifi) instead of cellular, your employer's system won't make the call?
The first thing I would ask you is, how do it know? Because the connection between you and VZW's internal system is just that--internal and a matter only between you and VZW. The outside world knows nothing about that.
So color me confused. When someone calls you, they're calling a number. The calling system has no idea what's happening as the various systems route that call--especially after it hits VZW's systems. That VZW has systems that allow you to hook in via a straight IP connection vs a cellular connection, is meaningless and invisible to the calling party.
Same with you calling them HOW you got inserted into VZW's system is meaningless; VZW routes you, complete with all the required metadata from your account, to the outside world. The outside world then routes the call to your employer, who doesn't know that you were initially inserted into the system via VZW's IP setup.
Now, I can see you sitting at work and their network system not letting your phone connect to VZW's systems for the purposes of making calls over IP. That's completely different.
But you calling them from the outside, when you happen to be connected to your home broadband instead of the cellular network? Sure, that's a valid call for any system to take and not worry about. Them calling out to your VZW phone number? Perfectly valid.