Architypes

Just been to another meeting where there was confusion over what an infrastructure architect does in comparison to an application architect. I cant understand this, its so obvious to me:

 

An infrastructure architect provides models and technology for the whole business (networks, mail, web ect). They have a budget allocated by the corporation.

 

A solutions or application architect provides models and technologies for one part of the business (customer management, Sales, Manufacturing etc). They have budgets provided by the line of Business.

 

What am I missing?