Most PBX station sets have an LCD or LED screen that can display messages. The type of information that is displayed varies with the PBX manufacturer and the programming capabilities of the switch. Typical information includes: calling/ called number ID from within the switch, ANI digits from the CO, hook state, time and length of call, name assigned to the extension, and message waiting notification. With a PBX Integration board, this information can be easily passed "unprocessed" to the application. This means that the same data that is sent to the display is captured by a PBX Integration board.
By capturing the same display messages that a phone set receives, an application can "see" and "record" the display information. This display information (in ASCII format) is especially useful in CT applications because it enables an application to know exactly what state the extension connected to the PBX Integration board is in. Applications used with a PBX that provides ANI digits may process the display data and use those digits to access related database information.
For applications using a PBX Integration board to program the Nortel Norstar, display data is indispensable. Because the programming menus and key functions change at different levels within the PBX software, the only way to know the current menu options is by having display text available.
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