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Figure 2: Examples of ISDN Devices supported by ISDN Simulator
Figure 3: ISDN Protocol Stack
While Q.931, the ISDN primary “dialing” protocol, usually is used to set up dynamic ISDN calls, ISDN simulator
also supports semi-permanent “nailed up” B channels that act like private leased lines.
Signaling for the D Channel
Before you congure signaling, you must have set the switch type. Once that is done, you will always need to
set the phone numbers (i.e., DN) and, if the congured switch type requires it, the SPIDs.
“Caller ID”, or, in formal ISDN terminology, “calling number identication presentation”, is always enabled.
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User Manual
2 Port ISDN Simulator