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Exchange SQL And IIS- P139:The following legacy Exchange features have been de-emphasized in Exchange Server 2007. What does that mean? It means that these features are still included in the Exchange product, but they’re not prioritized anymore, and will most likely disappear in the next Exchange release after Exchange Server 2007 | Introduction to Exchange Server 2007 Unified Messaging Chapter 11 667 The Unified Messaging Infrastructure Because the Unified Messaging component of Exchange Server 2007 connects with telephony and fax systems you should be familiar with basic telephony concepts and terminology. Private Branch eXchange PBX A PBX is a device that acts as a switch for switching telephony calls. This device is used to provide internal telephone connections and offer access to telephone numbers through shared outside lines to make calls external to the company. Additional communication devices can be connected to a PBX besides telephones such as fax machines voice mail systems and others. Calls from outside the company are transferred to the appropriate extension or forwarded by a human operator. IP-PBX An IP-PBX is a PBX that operates with Internet Protocol IP . This simplifies the infrastructure because telephones can be connected to the same local area network LAN as the computers and servers. The IP-PBX switches calls to the appropriate phone by using the IP address of the telephone. For using IP-based telephony all telephones must support the IP protocol. A hybrid IP-PBX supports IP phones but is also able to connect traditional analog and digital telephones. Voice over Internet Protocol VoIP This technology enables the use of IP-based networks as the infrastructure for telephone calls. IP or VoIP gateway IP VoIP gateways are hardware devices that can be used to connect legacy PBX systems to local area networks to provide IP-based telephony services. These gateways convert the legacy protocols from the PBX to VoIP-based protocols like SIP and RTP. For an up-to-date list of supported gateways see the link in the shortcut area of this section. Dial plan The dial plan is a set of rules that is used by the PBX to determine which action to take when it receives a call. For example a 0 is often used to get to the public telephone network. When the first number is not a 0 the PBX knows
