Oman's government monitors cell-phone conversations, e-mail exchanges, and Internet chat rooms, and restricts free speech on the Internet, blocking access to many websites and posting notices on other sites warning against criticism of the sultan or other officials. In the same way, the government limits the freedom of academics to discuss or write about certain matters, with faculty members engaging in systematic self-censorship. University professors are prohibited from writing about or discussing local politics, and are subject to dismissal if they violate this rule.