I learned about the position through recruiting on campus at my university. Schindler was specifically hiring for summer temp positions and I was encouraged to leave my resume and they'd contact me within the next week or so, and was told to not be alarmed if it took a few days because the person who does this step was on vacation. Sure enough, within a few days, I received a call that they wanted to set up an interview with me.
The interview process was technically in three parts: meet with two of the call center supervisors, if they like you then you meet with the call center manager, and if she likes you then you participate in an online simulation to make sure you understand the basics of a call center and have basic math & language/reasoning skills. I left with the business card for someone at the temp agency who would contact me within the next couple weeks to let me know if Schindler offered me a job.
The whole process was very laid-back, and every step was well-communicated, so I was never kept in the dark about what to expect.