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

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

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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

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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 )

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Network Diagram
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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

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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.

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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

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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

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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

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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

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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.
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Thank You!

For more info kelvin_at_nextixsystems.com htt
p//www.nextixsystems.com http//www.nextixsystems
.com/citywide-telephony.php http//www.nextixsyste
ms.com/citywidefactsheet.pdf