Good old ISDN. This section contains some information about the various specifications from our friends at the ITU, Bellcore/Telordia, Lucent and Nortel (you know the guys who still charge for standards).
|Q.921||June 2000||ISDN user-network interface - Data Link Layer|
|Q.922||Feb 1992||ISDN data link layer specification for Frame Mode Bearer Services|
|Q.930||March 1993||Digital Subscriber Signalling System No. 1 (DSS1) - ISDN user-network interface layer 3 - General Aspects|
|Q.931||May 1998||Digital Subscriber Signalling System No. 1 (DSS1) - ISDN user-network interface layer 3 - specification for basic call control|
|Q.932||June 2000||Digital subscriber Siganlling System No. 1 (DSS1) - Generic Procedures for the control of ISDN Supplementary Services|
|Q.950||June 2000||Supplementary Services protocols, structure and general principles|
|Q.951||Supplementary Services - Number Identification|
|Q.952||Supplementary Services - Call Offering|
|Q.953||Supplementary Services - Call Completion
(so we gotta pay extra to finish a call!!?)
|Q.954||Supplementary Services - Multiparty|
|Q.955||Supplementary Services - Community of Interest|
|Q.956||Supplementary Services - Charging|
|Q.957||Supplementary Services - Additional Information Transfer|
|SR-NWT-002361||1992||National ISDN-2 (NI-2)|
|SR-NWT-001937||National ISDN-1 (NI-1)|
|SR-NWT-001953||1991||National ISDN-1 (NI-1)|
|235-900-341||National ISDN specification.|
|235-900-343||Custom ISDN specification.|
|NIS S208-6||Includes NI-1,2 and Custom features.|
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