System information

Conclusion 236
12. Internet Call Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
DNS and SIP URIs 237
The SIP URI 238
SRV Records 238
Accepting Calls to Your System 240
Dialing SIP URIs from Asterisk 246
ENUM and E.164 247
E.164 and the ITU 247
ENUM 248
Asterisk and ENUM 249
ISN, ITAD, and freenum.org 250
Got ISN? 251
ITAD Subscriber Numbers (ISNs) 251
Management of Internet Numbering 251
IP Telephony Administrative Domains (ITADs) 252
Create a DNS Entry for Your ITAD 253
Testing Your ITAD 254
Using ISNs in Your Asterisk System 254
Security and Identity 256
Toll Fraud 257
Spam over Internet Telephony (SPIT) 258
Distributed Denial of Service Attacks 258
Phishing 258
Security Is an Ongoing Process 259
Conclusion 259
13. Automatic Call Distribution (ACD) Queues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Creating a Simple ACD Queue 262
Queue Members 266
Controlling Queue Members via the CLI 266
Controlling Queue Members with Dialplan Logic 268
Automatically Logging Into and Out of Multiple Queues 270
An Introduction to Device State 273
The queues.conf File 275
The agents.conf File 281
Advanced Queues 283
Priority Queue (Queue Weighting) 283
Queue Member Priority 284
Changing Penalties Dynamically (queuerules.conf) 285
Announcement Control 287
Overflow 291
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