Fred Posner

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

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

Fred Posner

Open Source VoIP Consultant

Fred provides SIP/VoIP Engineer consultation services including architecture, design, support, and more.

Have SIP. Will Travel.

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

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

Contact Fred

VoIP/RTC Expertise

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
FreeSWITCH logo
FreeSWITCH

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

FreeSWITCH Consultant
Asterisk logo
Asterisk

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

Asterisk Consultant

Testimonials

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

Fred should be your go to guy.

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

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

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

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

Selected Video

Open Source Software Myths

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