Fred Posner

VoIP Consultant

Fred's primary role is a VoIP Consultant, specializing in Open Source software including Kamailio (formerly OpenSER), Asterisk, and FreeSWITCH

For more than 20 years, Fred has provided SIP/VoIP Engineer consultation services including architecture, design, support, troubleshooting, and more to enterprises, businesses, and carriers.

Contact Fred
Fred Posner

Open Source VoIP Consulting

Fred has spent more then 20 years working with open source RTC software. From Kamailio/OpenSER to FreeSWITCH, SIP to RTP, Fred can help your business with design, implementation, scaling, support, and troubleshooting.

Kamailio logo
Kamailio

Kamailio expert, speaker, and consultant. Proudly working with Kamailio/OpenSER since 2005.

Kamailio Consultant
APIBAN logo
APIBAN

Fred launched APIBAN as a free service to help protect SIP servers from unwanted SIP traffic.

APIBAN
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FreeSWITCH

FreeSWITCH consulting since 2007. A great cross-platform telephony platform / PBX.

FreeSWITCH Consultant
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Asterisk

Asterisk consulting/support since 2002. Another telephony platform / PBX.

Asterisk Consultant

Have SIP. Will Travel.

Community Involvement

Fred loves the open source VoIP community and was honored to receive a 2019 SimCon Award (Pre-Posthumous Legend) recognizing his support and contribution.

Fred enjoys evangelizing open source telecom and has spoken at Kamailio World, Astricon, ITEXPO, Cluecon, Asterisk World, and more.

On-Site Assistance

Whiteboardings sessions, training, and projects sometimes need that in person touch. Fred has travelled throughout the world to assist his clients.

Daily and weekly consulting rates are available for on-site work.

Testimonials

Fred utterly embodies the definition of 'reliability' and 'quality'.

Dean Wells, Principal Program Manager

Fred should be your go to guy.

Michael White, Vice President of Open Source Sales at Sangoma

A tireless and enthusiastic advocate on behalf of the Kamailio project and, more broadly, in the service of the open-source VoIP ecosystem.

Alex Balashov, SIP Expert

Fred has a very strong work ethic and is a great problem solver.

Andy Day, Vice President Carrier Services

Fred's problem solving skills have a razor precision that borders on freakish.

Patrick Goldberg, Chief Solutions Officer

His tenacity for troubleshooting and work ethic stand as an example to others. Fred is basically the A-Team in a person.

Mel (Mack) McCarthy, Senior Engineering Manager

Selected Video

Open Source Software Myths

Presentation from Kamailio World 2018 in which Fred discusses common myths regarding Open Source software.