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Engineer Quality

Pottstown, Pennsylvania, United States
May 13, 2019

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Nicos E Stelikos H 610-***-****- M 484-***-****)

** **** **, ********, ** 19468

Professional Experience Summary / Objective

Systems engineer with experience in the fields of wireless, digital communications, and telecommunications; seeking a challenging position (Test, Integration) in the areas of Networking and VoIP/UC Engineering.

Technical Training, Certifications and Skills

CERTIFICATIONS: Cisco Certified Network Associate Collaboration, Valid 03/21/2022.

Cisco Certified Network Associate, Routing & Switching (CCNA), Valid: 03/21/2022

Implementing Cisco IOS Network Security (CCNA Security / 640-553), 03/21/2022.

NETWORKING SKILS: Routing, Switching (VLANs), IP Security, Collaboration (Voice / Video).


SDP (Media, Codecs, NAT), MGCP, Diameter, PacketCable, (basic DOCSIS), IETF (RFCs), 3GPP, ITU.

ACME PACKET: Net-Net 3000/4000 Configuration Basics, Net-Net 3000/4000 troubleshooting (2011).

TEKELEC: MGTS UNIX Operations; PASM Operations; SS7 Overview Course.

ALCATEL CIT (France)::Alcatel 900 NSS, SSP/HLR/RCP/OMC, Alcatel 900 GSM, O&M / E10 Switch.

VoIP: SIP Trunking, Cisco Gateways, Linksys ATA, Polycom / Aastra phones, Cisco Residential Gateways (eMTAs, Arris (Pace) Gateways, Adran 900/900e/600, Softphones (Cisco, X-lite, Mobile clients).

SOFTWITCHES / PBX: Metaswitch, Cisco Call Manager (CUCM, CME), OpenSIPS / OCP, Asterisk.


TROUBLESHOOTING TOOLS: Wireshark, tcpdump, SIP Workbench, Empirix (Hammer, XPA),

Tektronix IRIS, Putty tools (SSH), TeamViewer, SIP Hacking Tools (Kali Linux), SIPp, GNS3.

Computer Languages: C, C++ (basic), Python (basic), Linux (Ubuntu, Red Hat - basic), Shells (Bash).

Languages: Proficient in English and Greek. Knowledge of French.


MS, Rutgers University, (DSP, Digital Communications), NJ.

BS, Electrical Engineering, Rutgers, NJ.

HTI Diploma, Electrical Technology, Cyprus.

Selected Accomplishments

Discovered Integration (Residential VoIP, IMS / VoLTE) flaws and wrote Network tickets on UDP Fragmentation pitfalls, SIP message size control (rfc3261), SIP Timers Issues, ALU SBC Role deficiencies, Metaswitch VM Server signaling Issues, IMS SDP (Codecs Rules).

Discovered persistent and performance affecting problems for incoming SIP calls (Broadview).

Designed, tested and implemented a Network-wide “t38” fax configuration in favor of other less robust technologies (g711) and thus eliminating the vast majority of fax failures (HWC).

Designed an MSC (Catapult MGTS, RCP, SSP, PSTN SIM, ISUP, INAP) Simulator (Lockheed).

Provided leadership, critical skills and problem solution in the deployment and operation of the ACeS Satellite System, as the MSC Responsible Engineer (RE). Identified, debugged and proposed solutions for the BSC-GSC-UT functionality.

Developed the Test Plan, Test Procedures and scripts (MGTS) for a major MSC Release (Alcatel R4.2E). Successfully tested the MSC for all scenarios (single, load, conformance, performance).


Genesis Networks, ATT Labs, Middletown, NJ (04/01/2014- 12/31/2018

Voice Test Engineer III

Executed VoIP testing for Residential Gateways (Arris, Pace) over AT&T’s Legacy and IMS Networks.

Tested the ADSL/VDSL Gateways (12 different models) for all VoIP applications, call processing scenarios (IMS, IP Phones, VolTE, PSTN), conformance to standards (Telcordia, IETF. ANSI, ITU),

SIP Call Flow Troubleshooting, Protocol Testing, And Residential Feature Testing.

Performed SIP / PSTN / Internetworking defect analysis and troubleshooting of FXS Voice lines;

Uncovered Issues with Block Announcements, not disconnecting properly.

Led several Testing efforts (Jira tickets) for Residential Gateways ; Geo-redundancy failures, Register Floods, Feature Precedence Issues, IAD behind RG Issues (NAT, SIP ALG, Broadcom Issues).

Developed and Utilized an Ad-hoc Test Plan (complex scenarios) to compliment Manual and Automated Testing. Uncovered intermittent and hidden failures happening on Nokia IMS Core Nodes.

Contributed towards other Teams’ tickets; TCP Flows Optimization, ECO CMS (TR-069) Issues, Wi-Fi tickets (band-steering), Authentication of SIP Endpoints Algorithm Testing.

Participated and provided recommendations for an FCC reported Outage, affecting thousands of customers.

Broadview Networks Inc., King of Prussia, PA (02/04/2013- 02/07/2014)

Senior Network Engineer

Troubleshot and repaired Tier 2/3/4 tickets (Voice, QoS, SIP, Data, Fax, IP Centrex - Mitel, ACD Queues).

Provided solutions to Endpoint and Element configuration problems (Cisco, Acme SBC).

Assisted the team in Packet capture (Empirix, Wireshark) and Protocol (SIP, SS7) Call Flow projects.

Hotwire Communications LLC, Wynnewood, PA (04/2011- 12/28/2012)

Voice Engineer

Worked for the Operation, Maintenance, Integrity and Optimization of the Voice Network (Metaswitch, Acme Packet SBC, SIP Trunks and Level 3 interworking). Assisted TAC in Problem resolution.

Configured, Troubleshot and Tested VoIP Devices and Phones; Took the lead on Cisco ATA, Adtran IADs (900 Series), Cisco Call Manager (CME on 2801 with IP 7962 phones), Polycom phones, SBC Security).

Harvey Nash Inc. – Comcast Corporation (TQA), Moorestown, NJ (06/2008-10/2008)

Senior Voice Engineer

Worked on a Comcast Family Plan telephony product, utilizing the Thomson ACG905 eMTA device.

Analyzed and Developed test cases (HP-QC Tool) for Voice Calls (CF, CW, Three-Way calls, CH, Join in-progress, Toggling), Data Calls (Weather, News, Horoscope), Email, SMS, CALEA and Voicemail calls.

IIC / Apollo Consulting – Telcordia Technologies, Piscataway, NJ (10/2007-03/2008)

Software / Quality Engineer

Testing of different components of an ISCP, AIX based Real-time Telecommunications Billing system (Emergency, Free, Barred, Prefix, Friends & family, Special Handling, Short Codes, and IVR).

Studied and Tested Call flow Scenarios, on CAMEL (Phase 2/3), INAP, MAP Interfaces.

True Position, Berwyn, PA (07/2006-03/2007)

Senior Product Introduction & Verification Engineer

Interoperability testing with Siemens, Nortel and T-Mobile on Location Interfaces and technologies (SS7, SIGTRAN, Lb, Lbis, U-TDOA, CGI+TA, LMU, WLG, SMLC, SCOUT, Re-homing, E-911).

Lockheed Martin (IS&S, LMGT), King of Prussia, PA (05/2001-06/2006)

Staff Systems Engineer

Co-authored a Network Design Top / Down Procedure Document (LAN, WAN, Wireless, VoIP).

Analyzed Push-to-Talk technologies and wrote white papers for PTT over GSM/GPRS/UMTS.

Developed an MSC (ISUP, RCP – GSM “A Interface” and eight phone lines) simulator.

Lockheed Martin Overseas Services Corporation (LMOSC), Jakarta, Indonesia (05/1999-05/2001)

Staff Systems Engineer

Commissioned and Tested three switches (MSC), one STP (Batam, Indonesia), and carried out the PSTN/GSM/ACeS integration (Philippines, Thailand, Indonesia) along with Alcatel and National teams.

Participated and led the Jakarta team in Pre-launch System testing using the Palapa satellite and post-launch testing using the ACeS Garuda satellite; monitored the system for any abnormalities on a daily basis.

Solution of MSC and system problems (PSTN links, STP connections, Satellite RF links, voice quality, translations, roaming, data/fax calls, Network integration Timers).

Lockheed Martin Management and Data Systems (M&DS), Valley Forge, PA (06/1996-05/1999)

Staff Systems Engineer

Played a key leadership role in all aspects of Gateway Element (GELT) Testing and System Integration Testing (I&T) for various sub-systems, equipment and simulators (NCC, TCE, STP, MSC).

Led the modification of Tekelec’s software libraries using the Protocol Builder (Um, Abis, and GSM 04.08) into ACeS standards; thus establishing the availability of one of the main simulation tools.

Developed PSTN (SS7 ISUP), Gateway Station Controller (GSM 08.08), HLR / VLR (GSM 09.02) simulators; tested the Alcatel 1000 E10 under single call scenarios, load traffic and roaming (MGT

Led an effort in using Racal’s User Terminal (UT) simulator for testing the Ericsson R190 dual-mode ACeS / GSM phone. Developed the scripts for testing the Call Supplementary Services.

Telephonics Corporation, Huntington, NY

DSP/Communications wireless Engineer

Proof of concept simulation and support to the RF and Software groups for wireless technologies (AMPS, IS-136, IS-54, GSM). Evaluation of RF / Microprocessor / DSP integrated designs.

Used SPW (Designer / BDE, Signal Calculator, Signal Flow Simulator, Filter Design System, DSP Library, Communications Library and “C” Code Generation) in Simulation and Emulation of Wireless systems.

Call Forwarding Technologies, Greenvale, NY

DSP / Software Engineer

Designed and developed DSP (ASM 56002) algorithms (voice-mail, voice recognition, call processing).

Rutgers University, Department of EE, New Brunswick, NJ

Research Assistant, Teaching Assistant

Analyzed Error detection and correction algorithms for digital and storage system applications.

Taught undergraduate Electrical Engineering Laboratory courses. / TA in Systems Analysis.

Awards and Professional memberships

Pride award, Lockheed Martin (1997), Lockheed Martin (I&SS) Award (2005).

Space Systems Award (ACeS Team Award), AIAA, Philadelphia section (2000)

Member of IEEE (Computer, Communications).

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