HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual page 404

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Configuring Demand Routing for Primary ISDN Modules

Overview of ISDN Connections

Call Process

Figure 8-4. ISDN Call Setup Process

Placing a Call. When you use your telephone to place a call, you pick up the

phone and get a dialtone, which signals that the phone and voice switch are

ready. After you dial a number, your telephone, the public carrier's voice

switches, and the receiving phone must exchange frames to establish the

Similarly, when an ISDN modem initiates a connection to another modem, the

calling modem, the public carrier's switches, and the receiving modem, must

exchange D channel frames. The following is the procedure when placing an

The calling modem is activated and sends a SETUP to the switch.

If the ISDN switch is available and ready, it sends a CALL PROC to the

caller and a SETUP to the receiver.

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