LAMP stack questions, PHP framework question, Mysql optimization question, simple coding test, MVC question about PHP framework, fundamental php questions, when I can start the work, describe the background of the company, describe myself a little bit,

I got a 15-mins phone interview with their technical manager. The interviewer was nice at the beginning, but later he became impatient and told me that my voice was not clear. I don't know whether it was my speaking problem or an issue with his speaker. Then he made another call, and he still claimed he can't hear me. Anyway, that was an embarrassing and very unprofessional phone interview.