Kamailio and Voice over IP security assessment

Are you are operating some specific or proprietary Kamailio modules in your VoIP infrastructure? Then you should harden them against attacks. We will test your software against know security issues and also unknown security vulnerabilities on our infrastructure. We will tailor the scope of the assessment to your needs and document the results in an extensive report. You can find more informations about this service here..

Kamailio and Voice over IP consulting

We provides consulting services for Kamailio and voice over IP services in the performance, reliability and security area. We has experience with several of the biggest Kamailio infrastructures in the world.

Open Source development

We are extensively involved in improving the Kamailio server. If you would like to support this Open Source work and help to make Kamailio more secure and stable, please contact us.


For inquiries related to security testing, consulting or open source development please contact us here..

General information

Henning Westerholt is an experienced IT manager for IT Operations and software development. During his career he was responsible for different products at IT service providers and also for the internal IT of different large manufacturing companies in Germany. He provides consulting services for Kamailio and VoIP services in the performance, reliability and security areas. Henning is one of the core developers of the Kamailio Open Source project since 2007 and member of the Kamailio Management team.

Management experience

He has a broad experience as IT manager, being responsible for one or several teams in IT Operations and software development in different roles in last 10 years. Henning is especially experienced in the IT Operations area, where he was responsible for a department of over 50 people with a budget of app. 20 Million Euro at TRUMPF.

Voice over IP

He was several years ago responsible at 1&1 for the operation of their Voice over IP and DSL platform. This includes the maintenance and deploying of extensions of the Kamailio, Radius, ACS and order middle-ware systems of 1&1. Henning was in charge with one of the biggest VoIP deployments out there in 2008, using Kamailio (OpenSER) as core routing system: over 3 Million users, over 7 Million phone numbers and 1.5 Million routed minutes per month.

Open Source

Henning is a long term Linux user and contributor to several Open Source projects, participating in world wide events, presenting about Kamailio (OpenSER) and open source. You can find his current presentations in his blog, old presentations are available here. If you like to support this Open Source work please contact us.


Henning Westerholt holds a bachelor and master degree in applied computer science from the University of Siegen.