Kostas Apostolidis

High-Level and Low-Level SIP-Trunking Design for business customers Customer Network Gateway, Network Access, IMS Core and AS, Service Provisioning, Billing/Mediation, OSS a.o.) Customer migration scenarios considered Developed Requirements for the NGOSS platform Capacity Management and Routing Policy NFV/SDN with Openstack Operations Manual (Betriebshandbuch) RFQ for Embedded-SIM Platform

Development, execution of various Test Cases for the Call Handling Features developed by Huawei Configuration of various test devices in the lab Pre-TAcc, TAcc and Regression Testing completed and fully reviewed Troubleshooting and feedback to Design Team and Huawei regarding bugs and design solution proposals

Freelance contractor working on behalf of Cisco Implementation of two IMS sites in the Lab comprising Oracle SBC/Core and Mavenir/Mitel MTAS a.o. Pre-TAcc testing Inter-operability testing with Cisco Packet Core, Nokia Circuit Core and terminal-vendors End-to-end TAcc-testing FAcc-testing in the Live network and supporting Operations with troubleshooting

Policy-based Solution Concepts and Design involving PCRF, GGSN/PGW and Online Charging. Business Requirements Impact Analysis (in Coordination with CRM, Provisioning, Charging etc). Low-level Design, Configuration and Testing using Huawei UPCC/PCRF, GGSN/UGW and HP OCS. Projects: Prepaid-Subscriber Migration, Speedboosters/Speedpolicies, Roaming (Holiday) Bundles, EU-Roaming Regulation III, Fair-Use-Policies a.o.

Huawei GGSN/PGW Release Testing (Huawei UGW9811, USN9810), Amdocs PCRF Testing Support, Feasibility Study/Design for Mobile IP VPN GDP<E, Gx interface New Features, DTD and Test Case Review, Configuration Troubleshooting and Support for Amdocs PCRF, Ericsson IMS Core, Mavenir MTAS

Consultant im Bereich IP Services, Packet Core, LTE, VoLTE, CSFB, RCSe, IMS, NGN (Platforms: Cisco ASR 5000, Mavenir mOne Convergence Platform)

Consulting/Expert Training for ICT-Firms in the areas of 3G Packet Core Technologies (LTE, MSS, IMS, NGN), Architecture, Protocols, Signalling, Applications, Network Design

Development/Delivery of Seminars in GPRS, MSS, IMS, VoIP & Multimedia

Detailed Design (Site, IP-Addressing, Applications) of O&M subnetwork for managing all nodes in the GPRS IP-backbone

Course development/delivery for Ericsson internal engineers GSM, GPRS, UMTS, MSS, IP und ATM