Essay about Introduction to the Asterisk Free PBX

Introduction to the Asterisk Open Source PBX

http://asterisk.org Mark Spencer

Linux Support Services, Incorporation. http://www.linux-support.net Shown first at Libre Computer software Meeting 2002 Bordeaux, Portugal July on the lookout for, 2002

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Introduction to Asterisk Asterisk is a completely Open Source, hybrid TDM and packet words PBX and IVR program. Asterisk is usually and has become Open Source beneath GNU GPL (with very permitted to get linking with the OpenH323 project, in order to provide L. 323 support). Commercial licensing is available via Linux Support Services, Inc. (http://www.linux-support.net) pertaining to applications where the GPL is definitely inappropriate. As opposed to many modern " soft switches", Asterisk can use the two traditional TDM technology and packet tone of voice (Voice over IP and Voice over Framework Relay) protocols. Calls switched on TDM interfaces provide lag-less TDM call quality, when retaining interoperability with VoIP packetized protocols. Asterisk provides for a full featured PBX, promoting virtually all standard call features on train station interfaces, such as Caller*ID, Call Waiting, Caller*ID on Call Waiting, Phone Forward/Busy, Contact Forward/No Solution, Call Forward Variable, Stutter Dialtone, Three-way Calling, Supervised Transfer, Unsupervised Transfer, ADSI enhancements, Voicemail, Meet-me Conference meetings, Least Expense Routing, VoIP gatewaying, Call Detail Records, etc . At the same time, Asterisk provides full IVR capability, programmable at a lot of layers, by a low-level C interface, to advanced AGI scripting (analogous to CGI) and extension reasoning interfaces. Asterisk IVR applications run easily from one software to another, and need not understand anything about the physical interface, protocol, or perhaps codec with the call they are working with, as Asterisk supplies total hysteria for all those ideas. Supported Components Asterisk facilitates a variety of equipment interfaces for bringing in telephone channels into a Linux box. In order of best supported to least supported: Zaptel (Zapata Telephony) interface The zaptel telephone infrastructure was jointly manufactured by Mark Spencer of Linux Support Companies, Inc. and Jim Dixon of Zapata Telephony. The zaptel program breaks together with the established typical wisdom by using the host processor chip to replicate the TDM bus which is typically built into other telephony interfaces (e. g. Dialogic and other They would. 100 vendors). The resulting pseudo-TDM structure is a system which requires somewhat more processor, for a substantial financial savings in hardware cost and increase in overall flexibility. Resources just like echo cancelers, HDLC remotes, conferencing DSP's, DAX's and more are substituted by computer software equivalents. Much like traditional hard-TDM interfaces, turning is done in near-realtime, and call qualities are substantially a similar. The pseudo-TDM architecture also can extend the TDM bus across Ethernet, networks. Zaptel devices likewise support info modes on clear funnel interfaces, which include Cisco HDLC, PPP, and Frame Relay A number of Zaptel compatible extremite are available by Linux Support Services. At the time of this writing, the following playing cards are available: X100P - Sole FXO Analog Interface (PCI) T100P - Single T1/PRI Interface (PCI) Page 2/16

E100P -- Single E1/PRA Interface (PCI, exp. Q3 2002) T400P - Quad T1/PRI Program (PCI) E400P - Quad E1/PRA User interface (PCI) S100U - Single FXS User interface (USB) Cpanel Telephony Program The Linux Telephony Program, was developed mostly by Quicknet, Inc. with help via Alan Cox. This user interface is aimed toward single analog interfaces and also provides support for low bit-rate codecs. The following goods are proven to work with Asterisk: Quicknet Internet Phonejack (ISA, FXS) Quicknet Internet Phonejack PCI (PCI, FXS) Quicknet Internet Linejack (ISA, FXO or FXS) Quicknet Internet Phonecard (PCMCIA, FXS) Creative Labs VoIP Blaster (limited support) ISDN4Linux The ISDN4Linux interface is employed primarily in Europe to create lines in Asterisk coming from BRI...



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