Pretty 'long-in-the-tooth' now but if you need high speed ('ish) switched access - ISDN is still the only real game in town.
|ISDN Signaling standards e.g. Q.921, 931 etc.
|Format of ISDN Q.931 packets.
|Message Types used in ITU/NI-1/Custom implementations.
|Information Elements (IEs) used in ITU/NI-1/Custom implementations.
|Standard Cause IE codes.
|Standard Progress IE codes.
|Standard Signal IE codes.
|ITU standard ISDN Timers e.g. T305 etc.
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