I am living in Panama (the country), and there are many call centers here. I worked in one, and I couldn't stand the stress, so I had to quit. I noticed that in call centers around here all calls come from the US. What kind of technology do they use for that? Are the call centers receiving the calls from the US through a parabolic antenna, or are these calls routed the way normal international calls are routed, which means using Panamenian-American phone companies?