Occasionally we get phone calls. People have an astronomy question and decide to call an observatory to get an answer. I would caution that this is generally not the best way to get an answer, Googling the question or looking it up on Wikipedia is much more likely to result in a usable answer. Usually our front desk will politely defer the caller to some other source, Shelly is very good at doing this.
Shelly is also a very nice lady who occasionally takes pity on some caller. Or the caller is very polite and asks very nicely. Often she forwards the call to me, knowing that I can usually answer these sort of questions.
What sort of telescope can be used to view the ISS?
At least the question did not involve aliens or NASA cover-ups, those question would have gotten the polite brush off from Shelly.
For someone who is inexperienced in using telescopes this not the easy place to start. Most of us who have been using telescopes for decades usually do not even try to do this. The space station is quite small and would require higher magnification to see well. It is also moving quite quickly across the sky. The combination of these two factors makes viewing the ISS a real challenge, to put it politely!