yes. this is called a "set top box" or STB health call.
I get them on work orders all the time.
The receiver if connected to a land based phone line is communicated with by Dish. The receiver during this "call" reports the function of the box including signal strengths. If the signals come in low ( could be in a middle of a heavy rain or snowfall) a computer generated service call is built on your behalf. The phone call is simply to alert you that there are issues and that Dish is sending a tech.