Henning Westerholt is one of the core developers of the Kamailio (OpenSER) Open Source project. He is responsible at 1&1 Internet AG 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 middleware systems of 1&1. Henning is in charge with one of the biggest VoIP deployments out there, using Kamailio (OpenSER) as core routing system: over 3 000 000 users, over 7 000 000 phone numbers and 1 500 000 000 routed minutes per month.

Henning is a long term Linux user and contributer to several Open Source projects, participating to world wide events, presenting about Kamailio (OpenSER) and open source. He holds a master degree in applied computer science from the University of Siegen.

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