Primary Rate ISDN specification development files

 Development files for the C implementation of the Primary Rate ISDN
 specification.
 .
 It was based on the Bellcore specification SR-NWT-002343 for National
 ISDN. As of May 12, 2001, it has been tested work with NI-2, Nortel
 DMS-100, and Lucent 5E Custom protocols on switches from Nortel and Lucent.