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The Crystal Clear represents a new generation of PBXs. This new generation of PBX are often referred to as IP based PBXs. The \'IP\' refers to the fact that they use the same Internet Protocol (IP) that you use when surfing the internet or sending an email. The most obvious implication is that using an IP based PBX allows you to make phone calls over the Internet as well as over the tradional Public Switched Telecomunications Network PSTN (i.e. AT&T, Telecom Italia, Bezeq etc). You have probably heard of it by now but just in case, making a call over the internet is referred to as Voice over IP or more commonly by the acronym VoIP.