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