1. Developing ISDN Applications

This chapter offers advice and suggestions for programmers designing and coding Global Call applications in a Linux or Windows environment. Specific guidelines for developing ISDN applications are provided. Topics include the following:

• ISDN Features and Benefits
• ISDN Signaling Concepts
• ISDN Connections
• Header Files
• Configuration and Resource Association
• Responding to ISDN Events
• ISDN Extension IDs
• GCEV_EXTENSION Events
• Run Time Configuration Management
• Service Request (BRI Only)
• Alarm Handling
• Error Handling - ISDN Cause Values
• Controlling the Sending of SETUP_ACK and PROCEEDING
• Handling Glare Conditions
• Send and Receive Any IE and Any Message
• Overlap Send
• Direct Layer 2 Access
• D Channel Status
• B Channel Status
• Call Progress and Call Analysis

Note: A multi-threaded application doing call control on Springware ISDN should have at most, one thread per device. In other words, two or more threads should not be used to make or receive calls on a single device, such as dtiB1T1.

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