Douglas Garstang (doug@pobox.com)

Current

Senior Systems Engineer at Mig33

Past

VOIP Convergence Engineer at OneEighty Communications
Senior Member of Technical Staff at Troika Networks
Perl Programmer at News Corporation

VoIP Operations Tech Lead at OzEmail Interline
Wolf Computer Solutions at Unix Admin and Business Partner
Technical Support Rep at Telstra Multimedia

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3 more...

Education

University of Western Sydney

Recommended

2 people have recommended Douglas

Connections

154 connections

Industry

Telecommunications

Websites

My Company

Douglas Garstang (doug@pobox.com)’s Summary

Douglas Garstang (doug@pobox.com)’s Specialties:

Asterisk, SIP, IAX, Polycom, Convergence, Redundancy, CLEC, Unix Admin, Linux, Solaris, Python, Perl

Douglas Garstang (doug@pobox.com)’s Experience

Senior Systems Engineer

Mig33

(Privately Held; 11-50 employees; Venture Capital & Private Equity industry)

June 2007 — Present (2 years 2 months)

* Designed and implemented a system around the OpenSER SIP proxy and syslog-ng to capture detailed outbound ISTP call records • Design of new features that would improve carrier ASR’s, using a combination of least cost routing, failover, selection of SBC with highest ASR to specific destination, selection of SBC with highest overall ASR, selection of closest SBC based on latitude and longitude.
• Built Nagios plugins in python to monitor and alert on voice network metrics.
• Built Cacti plugins in python to graph voice network metrics.
• Implemented inbound DID(direct inward dial) for an IVR with round robin load balancing and site-to-site failover.
• Designed and implemented new voice products and features with Asterisk with OpenSER.
• Worked with various ITSP’s and DID providers, such as Verizon, Teleglobe, Arbinet and Voxbone when provisioning new service and
debugging international call issues.
(and lots more that LinkedIn won't let me add...)
VOIP Convergence Engineer

OneEighty Communications

(Privately Held; 11-50 employees; Telecommunications industry)

September 2005 — May 2007 (1 year 9 months)

Responsible for implementing a hosted IP telephony product for a Competitive Local Exchange Carrier(CLEC) from conception to product release, and beyond. Critical requirements that I personally implemented for this system included carrier class system redundancy, scalability, and a myriad of business related, telephony feature sets, for customers. Redundancy was a fundamental requirement of the product. As a result, I architected the ability of the system as a whole to undergo single or multiple component failures virtually anywhere, with little or no impact on customers. Scalability was also a requirement. I designed the system such that new nodes could be added to increase concurrent call processing capacity. This new product was designed to work in conjunction with One Eighty’s Lucent 5ESS switch, eventually replacing it as One Eighty moved to a soft switched environment.
Senior Member of Technical Staff

Troika Networks

(Privately Held; 51-200 employees; Computer Hardware industry)

2000 — 2005 (5 years)

Performed SAN interoperability and integration testing in a complex, non-heterogeneous, multi-vendor, SAN environment.
Integrated various vendor LVM/HA/DMP software products as needed under various operating systems with the Troika Accelera SAN appliance.
Developed test automation tools in Perl and Python to test LVM/HA/DMP products.
Developed and documented an object-oriented test automation API in Perl and Python to test a complex SAN environment, and control various SAN devices such as switches, power sentries, user interfaces, proprietary appliances, storage arrays and host operating systems. Operating systems included Linux, Solaris, VMWare ESX, Windows, HP/UX, AIX and Tru64.
Automated and standardized the installation of Sun test systems with Solaris Custom Jumpstart, and Linux systems with Red Hat Kickstart.
Made operating system modifications as needed to achieve correct or optimum configurations in a SAN environment, such as modifying and recompiling Linux kernels.
Perl Programmer

News Corporation

(Public Company; 10,001 or more employees; Online Media industry)

December 1999 — July 2000 (8 months)

Creation of automatic Oracle data loading systems.
Developed a series of tools to take television programming data from approximately 35 different television channels for upload into to Oracle.
Developed tools to convert online media content to XML for distribution via SMS to cell phones.
Wrote technical development specifications for various projects.
Constructed list manager software.
VoIP Operations Tech Lead

OzEmail Interline

(Public Company; 11-50 employees; Telecommunications industry)

August 1998 — November 1999 (1 year 4 months)
Wolf Computer Solutions

Unix Admin and Business Partner

(Privately Held; 1-10 employees; Telecommunications industry)

March 1998 — June 1998 (4 months)
Technical Support Rep

Telstra Multimedia

(Public Company; 10,001 or more employees; Information Services industry)

November 1995 — March 1998 (2 years 5 months)