OpenSER, the Open Source SIP Server, is one of the most innovative and scalable VoIP softswitches. It is a flexible and cost-effective software solution that allows you to implement a large set of VoIP platforms, as size (from SMB, residential or carrier), services or models (end-user services, traffic trunking, application server). The "OpenSER Admin Training" course will deliver the deep knowledge you need deal with the diversity and complexity of OpenSER in order to properly configure and optimize your OpenSER system to speed up roll out and administration procedures. The training course is offered by the actual people designing and developing the OpenSER SIP server, in an interactive way, based on examples and hands-on work, in order to guarantee the best knowledge transfer.

Configuration Basics

Configuration frame
Core and module functions
Script routes
Processing flow
Basic VoIP Routing


Initial Request routing
CANCEL routing
Record-Routing and Loose-Routing
Sequential request routing
SIP Peering


PSTN and ACLs
Interdomain Peering
NAT Traversal


NAT detection
REGISTER processing
Call processing
Media Relay
Parallel forking with NAT

Daniel-Constantin Mierla is co-founder and CTO of Voice-System SRL. In June 2005, he co-founded OpenSER.org, a scalable and flexible open source SIP server, being also core developer of SIP Express Router (SER) from its early beginning in 2002. He has a Master degree in Computer Science and Engineering from the Polytechnics University of Bucharest. His experience was accumulated working as consultant for Orange Romania, branch of French Orange mobile operator, and researcher in network communications at FOKUS Fraunhofer Institute, Berlin, Germany.