Stefan Lieberth

Network Consultant / Solution Architect

2015	Solution Architect Large-Scale L3-VPN Migration	L3-VPN Design Redundancy/Availability design for XL/L/M/S and XS sites CoS Parameter Definition Technical Management during Rollout Process Design of Network-Based Firewall Approach Mobile Access to L3-VPN	-> more info
2013-2014	Technical Sales NFV Mobile Core for M2M	Technical Sales Presentations for GGSN/PGWs Feature Clarification for Radius and Diameter (Gx,Gy) interfaces Design of NFV architecture based on VMware Geo-Redundancy (stateful) APNs linked to L3-VPNs via NNI(type b)	-> more info
2012-2013	Solution Architect Mediation Systems for Offline Charging	High-Level Design for online/offline charging Charging Interface Specifications
2011-2013	Solution Architect Offline Charging IMS	Design of a Charging Architecture for Deutsche Telekom IMS network High Level Design Redundancy concept AVP definition to fulfill regulatory requirments Development of test tools in Perl and Wireshark Verification testing of charging records for specific call scenarios