Kostas Alexopoulos Email & Phone Number

• Support engineer for the implementation of Next Generation Voice (NGV) services such as Voice over LTE (VoLTE) and Voice over WiFi (VoWiFi) in Three Ireland network.• Deployment and operation of Ericsson vIMS nodes (MTAS,CSCF,IPWORKS,SBG,BGF,MRF).• Acceptance testing and E2E service testing for the new NGV solution.• VoLTE S8HR roaming testing execution in the Test Lab.• Tracing and Troubleshooting of complex signalling issues.• Analysis and evaluation of performance indicators.• Provide network configuration modifications (design,execution) for the optimization of the network.

County Dublin, Ireland

• Working as a support engineer to Caribbean mobile network operator Digicel covering several markets across the Caribbean and Central America for the stabilization and optimization of their networks. Resolving incidents in the CS Core network (MSC, MGW, HLR, HSS) based primarily in Ericsson equipment including O&M, KPI analysis, detailed call tracing and troubleshooting, deployment of new features and implementation of operator’s requirements.

• Working as PIDS troubleshooter for the Ericsson MSC (Resolving network operators issues/defects, Handling CSRs, Support on SW upgrades). • 2 months working in Ericsson China (Shanghai) for the virtualized MSC-S 17A solution (VNF). Release System Test, Robustness Test in the virtualized APZ 212 70.• 3 months working on-site in O2 (Telefónica UK) for the acceptance testing of MSS16A (MSC and MGW).

Integration & Verification Testing for MSC R14B and R15A LSV Hardening network.

• Verification engineer in 2G Call Re-establishment feature for Vodafone Egypt.• E2E verification activities for Call Re-establishment at real network (lab) in Ericsson Aachen.• On-site support for deployment of the feature in Vodafone Egypt on behalf of Ericsson Egypt. Troubleshooting on SW faults during and after the deployment.

Jorvas,Finland

Integration and verification testing for MSS 15A in RVC LMF through Intracom telecom.

Paggani Area,Italy

• Integration & Verification Testing for MSC R14A LSV Hardening network.• Data Transcript preparation, System Test, Robustness Test, Acceptance Test.

Split,Croatia

Integration & Verification Testing for MSC R13A LSV Hardening network.

Patras,Greece

Troubleshooting/debugging on Trouble Reports from Ericsson customers (network operators) and I&V.

Patras

• Verification Engineer at Intracom Telecom.• Working in Ericsson Croatia (Zagreb) for 2 months as Troubleshooter and Integration Tester for MSC Blade Cluster phase 2 (MSC R14.1).

Madrid Area, Spain

Integration & Verification Testing for HLR R13.0.

Patras

Test cases preparation and execution,test design,test documents,test environment setup.

• Handling of Trouble Reportrs coming from Ericsson customers.• Providing Approved Corrections (ASA) and emergency corrections.• Fault reproduction and verification on simulated environment (SEA).

Diploma, Electrical And Computer Engineering

Master Of Business Administration - Mba