1.7 Global Call API versus ISDN API

Many existing R4 applications today make use of the rich Dialogic ISDN API. This API has been evolving over time, and provides access to two levels of abstraction, known as layer 3 and layer 2. When using DM3 boards, the ISDN API is not supported; however, much of its layer 3 functionality can be accomplished today directly and at a similar level of abstraction using Global Call.

If you want to port an existing ISDN application that uses Springware boards to an ISDN application that uses DM3 boards, you must replace the ISDN functions with equivalent Global Call functions. Most of the ISDN API functions have the cc_ function name prefix.

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