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

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

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  1. Citywide Voice and Video Using Asterisk and Open-Source Embedded Hardware Kelvin Chua Chief Technology Officer NEXTix Inc. Astricon 2009

  2. 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

  3. 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

  4. 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 :)

  5. Network Diagram

  6. 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

  7. 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.

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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.

  13. 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

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