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152
purpose of, 166
REGEX, 187
STRFTIME, 187
syntax, 166
dynamic feature-map creation, 193
expressions and variable manipulation
basic expressions, 163
operators, 165
GoSub() dialplan application
defining subroutines, 175
purpose of, 175
returning from subroutines, 177
local channels
independent control example, 178
problems to address, 180
purpose of, 177
dialplan basics
basic dialplan for device testing, 73
building interactive dialplans
advanced digit manipulation, 105
Goto(), Background(), and WaitExten()
applications, 89
handling invalid entries and timeouts, 92
include statement, 106
NANP and toll fraud, 103
pattern matching, 101-105
using Dial() Application, 93
using variables, 96
channel configuration, 66
dialplan functions, 16
dialplan purpose, 21, 77
dialplan syntax
Answer(), Playback(), and Hangup()
applications, 85
applications, 84
basic dialplan prototype, 87
contexts, 78
extensions, 81
extensions.conf file, 78
hierarchical components, 78
priorities, 82
Hello World example, 87
popular dialplan applications, 11
security vulnerabilities, 371
digital signal processing (DSP), 3
DigitalOcean, 29
Digium Asterisk Hardware Device Interface
(DAHDI), 22, 154
Dixon, Jim, 3
domain validation (DV) digital certificates, 52
DTMF-based features, 190
E
EAGI (Enhanced AGI), 317
Electronic Frontier Foundation (EFF), 53
email, 144
emergency calls, 125
endpoint security
Index
|
385
challenges of VoIP security, 49
securing media, 54
securing SIP, 50
environment variables, 98
extended validation (EV), 54
extension numbers, 60
extension states, 241
extensions (see Asterisk extensions)
Extra Sound Package, 86
F
Fail2ban
benefits of, 368
configuration, 369
installation, 369
FastAGI (AGI over TCP)