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Citywide Voice and Video Using Asterisk and Open-Source Embedded Hardware. Kelvin Chua Chief Technology Officer NEXTix Inc. Astricon 2009. Taguig City, Philippines. High monthly recurring telecommunication costs Legacy EOL PABX Non-resilient single point of failure Flexibility issues

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slide1

Citywide Voice and Video Using Asterisk and Open-Source Embedded Hardware

Kelvin Chua

Chief Technology Officer

NEXTix Inc.

Astricon 2009

slide5

Taguig City, Philippines

  • High monthly recurring telecommunication costs
  • Legacy EOL PABX
  • Non-resilient single point of failure
  • Flexibility issues
  • No contact-center features
  • No cdr reports and call statistics
  • No centralized dial plan
  • Highly dependent on PSTN infrastructure
slide6

Project Advantages

  • Virtually unlimited phone lines/numbers
  • Centralized communications
  • 24/7 Inquiry and emergency hotline service
  • Security and reliability
  • Scalability and Extensibility
  • Faster deployment
  • Ease of operation
slide7

Project Design and Implications

  • Less interconnection with the PSTN
  • Network and application layer redundancy
  • QOS on all data nodes
  • Remote site contact-center integrated
  • Network monitoring system
  • Disaster resiliency
  • And most importantly, least cost :)
slide10

Project Implementation: Data Network

  • Choice of technology: 802.16e WiMax
  • Multiple Star Topology
  • QOS on both the client and central nodes
  • VLAN tagging across the wired and wireless network
slide11

Project Implementation: Telephone Network

  • Initially 2 ISDN PRI from 2 different providers as the main PSTN interface and an ITSP link via SIP
  • 2 Digium 24port for interim connectivity to legacy PABX
  • A minimal number of landlines were maintained for redundancy in far-flung areas. These are connected to embedded asterisk-based appliance.
slide12

Project Implementation: Asterisk Servers

  • 4 Asterisk servers in 2 physical locations
  • Clustered dialplan (primary and secondary proxy)
  • Fax dispatch system based on hylafax and iaxmodem
  • Autoprovisioning
  • Mysql backend
  • Support for SIP video endpoints and video conferencing
slide13

Project Implementation: Embedded Appliances

  • Based on Blackfin DSPs
  • Fanless, Solid-state open-hardware design
  • Supports FXO, FXS and PRI
  • Embedded firmware with GUI
  • Clustered dialplan
slide14

Project Implementation: Network Monitoring System

  • Based on Cacti open-source graphing solution
        • SIP/IAX peers online/offline as well as concurrent SIP/IAX/Dahdi(Zap) calls
        • System voicemail
        • Heartbeat and threads
  • SNMP
  • Automated triggers and alerts
slide15

Project In Action:

  • Sudden ease in remote inter-department calls
  • Unauthorized toll calls were eliminated
  • Government services became more efficient
  • All incoming calls, including death threats, extortion and corruption activities are now monitored
  • Cost savings on monthly recurring telecom charges
  • Proven disaster survivability
slide17

September 26, 2009 at the height of tropical storm “Ketsana”. Asterisk saved a lot of casualties, serving thousands of calls a day for the city government's contact center.

slide18

Thank You!

For more info:

kelvin@nextixsystems.com

http://www.nextixsystems.com

http://www.nextixsystems.com/citywide-telephony.php

http://www.nextixsystems.com/citywidefactsheet.pdf