Toshiba ISDN. System Programs Overview System programming for ISDN has some commonalities with T1 programming. ISDN programming follows two different paths, depending on whether Basic Rate Interface (BRI) or Primary Rate Interface (PRI) is being installed. Refer to Flowchart 7-1 and the following steps for an overview of each program’s purpose. ISDN features can be programmed onto the following systems as described: o DK40i and DK424 – support BRI S/T o DK40i and DK424 – will support BRI U basic features in Release 4.2 o DK424 supports PRI. ISDN Related Programs o Program 10-1–System Assignments: LED 16 determines the initialization process for BRI lines connected to the ISDN network (see 3-27). o Program 10-4–ACD/ISDN Parameters: LEDs 11 and 12 set the T-Wait ISDN PRI and BRI timers, respectively. T-wait timers are used for reducting overloading ISDN terminals during concurrent initialization, such as following a wide-area power failure. LED 13 specifies whether or not 3.1 kHz audio calls can be received as speech calls. LED 14 enables the ISDN “Start” code to be sent when the Speed Dial button is pressed (see 6-6). o Program 39–Telephone Feature Buttons and Program 59–Attendant Console Feature Buttons: A new button is provided called the 6WDUW button in both Program 39 (see 3-135) and 59 (see 3-111) to defeat the timeout when dialing is complete. Also a 6XE button is provided for entering sub-address information. o Programs 55-1 and 55-2–Least Cost Routing Modified Digits: Enables a sub-address separator (see 5-21). o Program 30 – Station Class of Service: LED 12 defines whether the button is used for dialing a sub-address or as a dialing separator. When LED 12 is ON, only the standard stations are affected. The DKT and EKT ports are ignored (see 3-73). If the first dialed digit is , the will be treated as a feature access code. If is entered at any point after that (in other words, as long as it is not the first digit dialed), then the system will treat the following numbers as a subaddress. A second should then be entered to indicate the end of the subaddress.