Telephony Integration
With unified messaging, Exchange is integrated into the telephony world. This integration takes place between the Exchange Unified Messaging (UM) Server and gateways or private branch exchanges (PBXs).
In a classic set of telephony and electronic mail systems, there are two separate networks that deliver voice messages and electronic messages (email). In the telephony system, there are separate components for the PBX, voicemail, external lines, and phones. Calls from the Public Switched Telephone Network (PSTN) come into a PBX device. Typically, an incoming call is routed by the PBX to the telephone. If the phone does not answer or is busy, the call is routed to the voicemail system. Similarly, email from the Internet arrives ...
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