Business and Technical details Mark Spencer What is
Business and Technical details Mark Spencer
What is Asterisk? “Asterisk is an Open Source, hybrid, TDM, and packet voice PBX. It is also an Interactive Voice Response platform with Automatic Call Distributor functionality. ”
Asterisk is fully Open Source ! *
Asterisk supports TDM Technologies
Asterisk is a Private Branch Exchange (PBX)
Basic Call Features
Advanced Features
Asterisk Supports Vo. IP (Packet Voice)
Asterisk is an Interactive Voice Response (IVR) Platform
Supported Digium Zaptel TDM Hardware ● TE 405 P / TE 410 P (Quad T 1 / E 1 Interface)
Supported Digium Zaptel TDM Hardware ● T 100 P (Single T 1/PRI interface—PCI)
Supported Digium Zaptel TDM Hardware ● E 100 P (Single E 1/PRA Interface—PCI)
Supported Digium Zaptel TDM Hardware ● TDM 400 P (Quad Modular FXS/FXO) FXO Module FXS Module
Supported Digium Zaptel TDM Hardware ● X 100 P (Single Analog Interface—PCI)
Supported Digium Zaptel TDM Hardware IAXy – Single FXS interface with Ethernet Backend
Supported Hardware ● ● ● Linux telephony (/dev/phone) interface – Quicknet Internet Phonejack – Quicknet Internet Linejack – Quicknet Internet Phone. Card ISDN 4 Linux supported cards OSS or ALSA compatible full duplex sound cards ● CAPI compatible ISDN (contributed) ● Voicetronix (contributed)
Why Asterisk for Telecom? *?
Asterisk as a Black Box
Conventional Softswitch Network
Where Asterisk Fits
The Big Picture
Example: 1 x 1 PBX
Example: 8 x 16 PBX
Small/Medium Enterprise
High Density IVR/Conferencing
Why Open Source— For Customers? ?
Why Open Source— For Suppliers? ?
Asterisk Architecture (Add some things? )
The Asterisk Dialplan
Extension Contexts
Uses of Extension Contexts Security Voice Menu Authenticated Services PBX Multi-Hosting Callback Services Daytime/Nightime Modes
Example Asterisk Dialplan
Extensions ● ● Conventional dialplans assign extension to physical interface Asterisk assigns extensions to list of applications ● Execution goes through priorities, one by one ● Applications can modify call flow ● Seamlessly integrates IVR apps into PBX ● May route by dialled and calling number
Extension Names ● May be any number of digits (max 128) ● May be string literals ● May pattern match (when preceeded with “_”) – 'N' – matches digits from 2 to 9 – 'X' – matches digits from 0 to 9 – '. ' – signifies end of pattern matching
Special Extensions ● 's' – “start” ● 't' – “timeout” ● 'i' – “invalid” ● 'o' – “operator” ● 'h' – “hangup”
Simple Extension with Voicemail exten => 600, 1, Dial(Zap/9, 15) exten => 600, 2, Voicemail(u 600) exten => 600, 102, Voicemail(b 600) Try dialing on Zap/9 for up to 15 seconds. If there is no answer send them to voicemail, preceeded by “unavailable” message. If the interface is busy, send them to voicemail with a “busy” message.
Extension for Psycho Ex-girlfriend
Example: Operator
Example: Outgoing Line with Least Cost Routing
Example: AGI Integration exten => s, 1, AGI(agi-lookup. agi) exten => s, 2, Background(intro) exten => 100, 1, AGI(agi-save. agi) exten => 100, 2, Dial(Zap/9, 15) exten => 100, 3, Voicemail(u 100) exten => 120, 1, AGI(agi-save. agi) exten => 120, 2, Dial(Zap/24, 15) exten => 120, 3, Voicemail(u 101) When an incoming call comes in, send it first to “agilookup. agi” which checks the caller's Caller*ID against a database and route them to the last person they spoke with.
![Example: Ringback [ringback] exten => s, 1, Ringing exten => s, 2, Wait(1) exten](http://slidetodoc.com/presentation_image/5e57e095b2c79564f4ea48e97ae9cc00/image-41.jpg "Example: Ringback [ringback] exten => s, 1, Ringing exten => s, 2, Wait(1) exten")
Example: Ringback [ringback] exten => s, 1, Ringing exten => s, 2, Wait(1) exten => s, 3, Congestion exten => h, 1, System(callback) [default] exten => 1234, 1, DISA(4321, trusted) exten => 1235, 1, Goto(ringback, s, 1) When extension 1235 is dialled, the call is sent into the “ringback” context which eventually calls a script to call the user and dump them into the DISA (with a password) when they answer.
![Example: Macro [macro-stdexten] exten => s, 1, Dial(${ARG 1}, 20) exten => s, 2,](http://slidetodoc.com/presentation_image/5e57e095b2c79564f4ea48e97ae9cc00/image-42.jpg "Example: Macro [macro-stdexten] exten => s, 1, Dial(${ARG 1}, 20) exten => s, 2,")
Example: Macro [macro-stdexten] exten => s, 1, Dial(${ARG 1}, 20) exten => s, 2, Voicemail(u${MACRO_EXTEN}) exten => s, 102, Voicemail(b${MACRO_EXTEN}) [default] exten => 1234, 1, Macro(stdexten, Zap/1) exten => 1235, 1, Macro(stdexten, Zap/2&Zap/3) Extension 1234 and 1235 are essentially identical, dialing one (and two) interfaces for up to 20 seconds, and doing voicemail.
Configuration Files /etc/asterisk -- Location of config files alsa. conf and oss. conf-- Sound card configuration asterisk. adsi -- ADSI feature script extensions. conf -- Static dialplan iax. conf -- IAX users, peers, friends, and parameters
More Configuration Files meetme. conf -- Meetme conference configuration modules. conf -- Modules, preloads, globals, and noloads musiconhold. conf -- Music on hold configuration voicemail. conf -- Voicemailboxes, general parameters zapata. conf -- Zaptel compatible device configuration
Programmability/Extensibility ● Dial. Plan ● AGI ● C-level API
More Resources for Asterisk ● Following commands at CLI> prompt: – – help show applications show application <foo> show dialplan
Helpful web sites asterisk. org www. digium. com markocam. com
Where do we go from here? *?
Thank you! http: //www. asterisk. org http: //www. digium. com
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