xii
Chapter 6
Using ISDN and DDR Technologies 125
How to Best Use This Chapter 125
"Do I Know This Already?" Quiz 126
Foundation Topics 130
POTS Versus ISDN 130
BRI and PRI Basics 131
Basic Rate Interface 131
BRI Protocols 133
ISDN Layer 1 133
ISDN Layer 2 135
ISDN Layer 3 138
ISDN Call Setup 139
ISDN Call Release 141
Implementing Basic DDR 141
Step 1: Setting the ISDN Switch Type 142
Step 2: Specifying Interesting Traffic 143
Specifying Interesting Traffic with Access Lists 144
Step 3: Specifying Static Routes 145
Step 4: Defining the Interface Encapsulation and ISDN Addressing Parameters 146
Configuring ISDN Addressing 146
Step 5: Configuring Protocol Addressing 147
Step 6: Defining Additional Interface Information 148
SPIDs 148
Caller ID Screening 148
Configuring Additional Interface Information 148
Passive Interfaces 149
Static Route Redistribution 150
Default Routes 151
Rate Adaptation 152
Bandwidth on Demand 153
Multilink PPP 153
Troubleshooting Multilink PPP 155
Advanced DDR Operations 157
Using Dialer Profiles 157
Rotary Groups 159
Dial Backup 161
Alternative Backup 163
Dynamic Backup 163
Static Backup 164