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.
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1. Advanced IP Telephony Solution 16 January 2008 IP Telephony at Your Fingertips Crystal
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4. Traditional Telephony Switch Soft Switch Connectivity to operator Analog Adaptors SIP Telephones Conference Server Voice Mail Server Music and announcements Subscribers Location server Ordinary Telephones And Fax Machines 16 January 2008 IP Telephony at Your Fingertips PSTN
5. Everything in ONE system Conference Server Soft Switch Powered by Connectivity to operator Voice Mail Server Music and announcements Subscribers Location Ordinary Telephones And Fax Machines Analog Adaptors SIP Telephones 16 January 2008 IP Telephony at Your Fingertips PSTN
6. The Big Picture Ordinary Telephones And Fax Machines SIP Telephones 16 January 2008 IP Telephony at Your Fingertips PSTN ITSP
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15. Select your SIP phone snom LinkSys Aastra Cisco PolyCom GrandStream 16 January 2008 IP Telephony at Your Fingertips PSTN ITSP
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18. Maximum Network Utilization Analog and Fax Phones Main Office POTS Gateway SIP Phones Large Branch SOHO Soft Phone 16 January 2008 IP Telephony at Your Fingertips PSTN WAN Internet ITSP
19. Easily Managed - 1 16 January 2008 IP Telephony at Your Fingertips
20. Easily Managed - 2 16 January 2008 IP Telephony at Your Fingertips
21. Billing 16 January 2008 IP Telephony at Your Fingertips
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