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Asterisk & VoIP. and it’s role in your enterprise. Asterisk?. Open-source software released under the GPL Sponsored by Digium, the main hardware provider for POTS interface cards Digium named in the top 10 open source companies to watch by networkworld.com

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Presentation Transcript
Asterisk voip l.jpg

Asterisk & VoIP

and it’s role in your enterprise


Asterisk l.jpg
Asterisk?

  • Open-source software released under the GPL

  • Sponsored by Digium, the main hardware provider for POTS interface cards

  • Digium named in the top 10 open source companies to watch by networkworld.com

  • Ports for most *nix systems including Solaris

  • Ports also available for OSX and Windows

  • Open standards along with some proprietary protocol support (like Cisco’s Skinny and MGCP)

  • Modular plugin type system


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Protocols Supported

  • SIP – Session Initiation Protocol

  • H.323 – Common in video conferencing

  • Skinny – Cisco IP Phones default protocol

  • MGCP – Media Gateway Control Protocol

  • IAX - Inter-Asterisk Exchange Protocol

Codecs Supported

  • G.711 – Best voice quality ~100Kbps

  • G.729 – Good voice quality ~40Kbps

  • GSM – Acceptable voice quality ~10Kbps

  • G.722, G.723.1, G.726, iLBC, Linear, LCP-10, Speex


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PSTN Interface Support

  • Analog

    • FXO

    • FXS

    • E&M (w/ or w/o Wink), Loop start, Ground start, Kewl start

  • T1

    • E&M (w/ or w/o Wink)

    • Robbed bit

  • ISDN (PRI & BRI)

    • 4ESS

    • Lucent

    • National

    • Some international support


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Biggest Features

  • Unified Voicemail

    • Voicemail to email (.wav files)

    • Video Conferencing messages to email (.mpg/.avi files)

  • Advanced Meetme conferencing - conference bridging

    • Web management interface

    • Support for conference numbers and passwords

    • Presenter and Presentee support (presenter can mute all participants, etc)

  • Contact Center Queuing

  • Interactive Voice Response

  • Automated Attendant

  • Video Conferencing (SIP and H.323)

  • Jabber / Google Talk integration

  • Find me / Follow me

  • Out of state DIDs (all VoIP systems)

  • Call monitoring and recording


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Normal PBX Features

  • Name it, it’s there


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Enterprise Features

  • Unified dialplan across many servers

    • SQL Compliant databases (through ODBC)

    • Native support for Mysql

    • LDAP integration

  • DNS SRV records

    • Make calling each other easy ([email protected])

    • Scalability

    • Load balancing

    • Phone provisioning

  • DUNDI – Distributed Universal Number Discovery

  • Works with SIP proxys to accept large amounts of phone registrations

  • AGI – Extend your system using C, C++, Perl, PHP, …

  • Custom CDR – Used for calling card integration, billing, …


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Asterisk Compatible Endpoints

  • Cisco IP Phones (except IP 7920)

  • Polycom IP Phones

  • Snom IP Phones

  • Avaya IP Phones

  • Linksys IP Phones

  • Many others

Asterisk Compatible Gateways

  • Cisco VoIP Gateways (anything MGCP, SIP, H.323)

  • Cisco Callmanager (through SIP and H.323)

  • Patton Smartnode


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Asterisk PSTN Interfaces

  • Digium

    • Analog (up to 24 channels on a single PCI card, FXO and FXS) with hardware echo cancellation

    • T1 / PRI / BRI – 1-4 on a single PCI card with hardware echo cancellation

  • Sangoma

    • Better analog support, but uses more PCI slots (or spaces)

    • T1 / PRI / BRI – 1-8 on a single PCI card with hardware echo cancellation

    • Clear channel DS3

  • Any SIP / H.323 compliant endpoint

    • Cisco x8xx series ISR routers


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Possible Asterisk Configurations

  • Full PBX

  • Add small remote sites onto traditional PBX

  • Trunk Routing Gateway

  • Toll Bypass Only

  • Service Component



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Traditional PBX with Remote Offices

  • Use of Digium appliance

  • Cisco x8xx routers


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Trunk Routing Gateway

  • Connect a traditional PBX to services like Sprint SIP Trunking


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Toll Bypass Only

  • Connect Traditional PBXs together over WAN Links


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Service Component

  • Meetme Conferencing Bridge

  • Voicemail / Unified Messaging

  • Add Softphones to non-VoIP PBX


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Drawbacks

  • No PCI-Express Support (just came out for digital interfaces, still none for analog interfaces)

  • Hardware sizing information hard to find

  • Kernel updates break Digium drivers

  • PCI Bus sharing can cause significant problems with voice quality

  • NAT Traversal (common across any SIP system)

  • Linux system QoS not very mature yet

  • No VoIP security yet, although planned

  • Not for *nix beginners


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Support

  • Certifications – dCAP (Digium Certified Asterisk Professional)

  • Voip-info.org (VoIP WIKI site)

  • Commercial support (through Digium)

  • Partners (certified or un-certified)

  • Mailing Lists (very active)

  • User Groups (although none in Boston)

  • Astricon (Asterisk conference)

  • Books


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Where to start?

  • www.asterisk.org (Asterisk main page)

  • www.asterisknow.org (Asterisk and CentOS with full installer)

  • www.voip-info.org (huge resource for VoIP related projects and configuration info)

  • www.digium.com (hardware manufacturer and project sponsor)

  • Trixbox (formerly Asterisk @ HOME)

  • User Groups – Find one close or we can try to start one

  • Books – O’Reilly, Asterisk for Dummies, Asterisk configuration guide, …


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