MOHAMMED MINHAJUDDIN
Oshawa,ON
Summary
Wireless / IMS / Telecom Engineer PROFESSIONAL SUMMARY Skilled technical professional equipped with 15+ yrs. of excellence in E2E service management in Telecom wireless industry with enormous experience in leading-edge IP networks and OTT applications that offer Converged Communications Services including Presence, Push-to-Talk over Cellular (PoC),Instant Messaging, VoLTE / ViLTE / VoWiFi / UC&C / VoIP and Multimedia on Next-Generation Networks 5G and 4G (LTE / CAT-M / NB-IoT) including external networks such as IP Multimedia Core Network Subsystem (IMS)
Overview
20
20
years of professional experience
Work History
Design Specialist
TELUS
06.2022 - Current
- Integrated and validated Motorola’s cloud based solution (Critical Connect) over MPLS to place calls seamlessly from enhanced Push-to-Talk device to Land Mobile Radio extending coverage and interoperability between LMR and broadband networks
- Monitored and managed traffic performance in converged networks for public safety grade dispatch solution using NetScout nG1 (n-Genius One) and troubleshot production issues with packet sniffer tools such as wireshark, tcpdump and log analyzer
- Certified BELL and TELUS’ Push to Talk App (available on Google Play & App Store) with features based on 3GPP Mission Critical Push-to-Talk (MCPTT) standards (Remote Monitoring and Emergency Services) using Integrated Web Dispatch Console resulting no more communication boundaries
- Managed QA team of 8 testers and developed over 1500 test cases for TELUS’ IMS / VoLTE / RCS Solution to provide Multi-Media and Rich Communication Suite services to its wireless customers according to IR 92, IR 94 / OMA / GSMA industry standards on various platforms comprising Apple iOS, Google Android, PC Windows & Mac
- Integrated and troubleshot cloud-based platform (UCCaaS) in a multivendor set-up to expand Rogers wireline coverage countrywide by interconnecting with 3rd party carriers through SBC (Session Border Controller) in Network-Network Interface (NNI) as IBCF (Interconnect Border Control Function), Orchestrated the deployment of the VoLTE prepaid solution for TELUS, encompassing meticulous validation of the online charging system, adept troubleshooting of end-to-end service scenarios, proactive engagement in MOP discussions with both the vendor and operations team, and invaluable support provided to the UAT and CE teams for seamless project sign-off prior to the cutover
- Conducted comprehensive end-to-end Acceptance Test Plans (ATPs) for the Call Control Service on 4G VoLTE and 5G VoNR in both lab and production environments, leveraging Jenkins (Continuous Integration / Continuous Delivery (CI/CD) tool) and the SIGOS Integrated Test Environment (SITE), which resulted in the timely identification and resolution of potential issues
Network Engineer
Bell Mobility
01.2019 - 01.2022
- Monitored and managed traffic performance in converged networks for public safety grade dispatch solution using NetScout nG1 (n-Genius One) and troubleshot the production issues with packet sniffer tools such as wireshark, tcpdump and log analyzer
- Collaborated with development and VAS engineering teams to identify, understand and support deployment activities by executing ATP, FATP and IOT / IODT test cases in staging lab and production environments
- Performed root-cause analysis on incidents, resolving all problems identified during the incident, and most importantly, applying the lessons learned from the incident to prevent future occurrences
- Created BMC Remedy (ITSM) modification requests and evaluated MOPs with vendors and the Bell Network Management Services Team, as well as being accessible for help during maintenance windows
- Interacted with support, development, and infrastructure teams to identify trends and potential problem sources, as well as perform error resolution initiatives that helped secure and improve service quality.
Network Designer
Rogers Communications
01.2016 - 01.2019
- Integrated and troubleshot cloud-based platform (UCCaaS) in a multivendor set-up to expand Rogers wireline coverage countrywide by interconnecting with 3rd party carriers through SBC (Session Border Controller) in Network-Network Interface (NNI) as IBCF (Interconnect Border Control Function)
- Tested and analyzed NB-IOT solution in Rogers network for LTE band 12 and band 4 to leverage existing 4G network using QXDM / QPST / QCAT / QMI / XCAL tools
- Analyzed traces for VoLTE S8HR Roaming (VoIMS calls are home routed via S8 interface) which allowed customers to roam into partner network (V-PLMN) and also partner operator to roam in Rogers network
- Validated the functionality of IMS core nodes (CSCF, MTAS, SBG& DNS/ENUM) to expand Rogers wireless coverage to 4.5 million subscribers without disrupting the existing VoLTE, VoWiFi and UCC services
- Managed system level provisioning for BroadWorks Telephony Application Server (BTAS) via CommPilot Web Portal and Command Line Interface (CLI) in production and pre-production environments to assist engineering and operations team to perform E2E functional acceptance test plan (FATP)
IMS / VoLTE Engineer
ERICSSON
01.2015
- Addressed and investigated VoLTE call drops / failures, problematic handovers due to interoperability complications or timeout triggers using Tektronix Communications’ Iris Session Analyzer (ISA), Qualcomm’s QXDM and Wireshark to understand and characterize negative impacts to the calling experience
- Substantiated Supplementary Services Configuration for Wi-Fi calling solution (VoWiFi) using XCAP with both SSO and GBA based authentication enabling operators to extend the use of IMS-based VoLTE services to include carrier supported Wi-Fi calling using a residential Wi-Fi network
- Validated proactive transcoding procedures on SBG and BGF in compliance with 3GPP specifications where codecs can be added to the forwarded SIP/SDP Offer in order to allow calls between telephony clients that use incompatible codecs
Applications QA Lead | Network Q/A Tester
TELUS
01.2013 - 01.2015
- Developed and validated VoLTE device conformance test plan that certify a correct, stable, and effective VoLTE UE covering major functional and characterization requirements of Voice over LTE and SMSoIP services defined by 3GPP Release and GSMA compliance with high-definition (HD) quality voice & video
- Enriched troubleshooting time productivity to drill down the root cause to provide end-to-end service assurance for VoLTE / ViLTE / VoWiFi using Iris Session Analyzer and Protocol Analyzer, BrixWorx System and Sandbox
- Measured and compared Push-to-Talk call performance KPIs (End-to-End Call Setup time, In-call Media Latency and Codec evaluation) on IP-based next-generation networks (NGN) using Malden Electronics MultiDSLA Speech Performance Measurement System
Quality Assurance Analyst
Bell Mobility
01.2012 - 01.2013
- Tested and qualified Bell’s Push-to-talk App (available on Google Play & BlackBerry App World) providing instant communications for various Android and RIM devices
- Captured and analyzed SIP and RTP logs using Qualcomm Logging Tools (QXDM / QPST / QCAT), BlackBerry Software Logging Tool and Network Protocol Analyzer (Ethereal / WireShark) and further reported the issue to the vendor in detail which significantly reduced the complexity involved in launching and sustaining the services
Senior Network Technician / Support
Legacy Leaders
01.2011
- Supervised multiple tasks with varying priorities; interfaced with departments to ensure smooth technical operations, productivity and marketing
- Identified areas of improvement; researched, developed and implemented improved procedures
- Implemented MS Project Server 2003 and created a remotely access MS Project master project plan publishing machine on a CITRIX XEN virtual server to facilitate collaboration between managers, team members and clients
- Managed helpdesk and remote IT support for both company local (Toronto) and remote (Las Vegas) staff as well as for company clients throughout North America
Telecom & Network Supervisor
Ecolog International FZE
01.2007 - 01.2011
- Facilitated technical vision of High Speed Internet Services across 50 military camps; reported to VP and liaised with Project Managers, resulting in low-cost and fast integration of network and VoIP services
- Administered and maintained communications service network including IPoS, VoIP (Asterisk), Video conferencing (Polycom); resulting in trouble-free interaction within the company
- Provided online support for all the satellite and IP telephone devices ( based on H.323 and SIP signaling protocols ) in Asia, Middle East and Africa for highly sensitive military camps with high speed voice and data transmission
- Implemented VSAT (HUGHES & iDirect terminals) satellite communications systems in remote sites to expand global communications capabilities between headquarters, field offices and clients
Service & Support Engineer
Global Technical Systems, SAIF Zone
01.2004 - 01.2006
- Acted as an interface between development and testing teams for remote based vehicle tracking system on GPS, GSM & GPRS technologies ensuring testability of software and hardware by participating in the design flow
- Developed and delivered presentations and proposals for Fleet Mgmt
- Solutions including responding to RFP's
- Provided online and on - site support for all the satellite communication devices to the customers in the Middle East
- Managed and controlled servers at data centre providing 24/7 support in a mission-critical environment
- Designed catalogues, brochures and banners for trade exhibitions like GITEX and THURAYA SERVICE FORUM using Adobe Photoshop 8.0
- Conducted quality assurance of all wireless telecom products and GPS tracking software to ensure the customer satisfaction
- Created vector and raster maps, using GIS (GEOGRAPHIC INFORMATION SYSTEMS) softwares (ESRI and MapInfo) to track people, vehicle and asset location against detailed street maps via GPS
- Involved in pre - sale and after - sale activities
Education
MCA - Computer Applications
Osmania University
Skills
- Technologies: 3G, 4G and 5G
- Functional and Regression Testing
- IMS / VoLTE / RCS Procedures & Protocols
- EPC & EUTRAN / CAT-M / NB-IoT
- SBC / IBCF / HSS / IPWorks (ENUM DNS)
- VoLTE S8HR Roaming Architecture
- Tools: NetScout nG1 (n-Genius One) / nSA / nBA / IRIS / OSix
- 4G / 5G Call Flows
- Methodologies: AGILE / SCRUM / DEVOPS
- Integration and Performance Testing
- CSCF / MTAS / SCCAS / BTAS / SBG
- 3G ICS, SRVCC, E‐911 & SMSoIP
- SIP, RTP, SRTP, MSRP, IMAP, XCAP, RoIP
- IPv6, IPv4, SSL, IPSec, TLS, TCP& UDP
- Other Tools: QXDM / Wireshark / SIP Inspector
- MCPTT (Mission Critical Push to Talk)
Accomplishments
· Integrated and validated Motorola’s cloud based solution (Critical Connect) over MPLS to place calls seamlessly from enhanced Push-to-Talk device to Land Mobile Radio extending coverage and interoperability between LMR and broadband networks
· Monitored and managed traffic performance in converged networks for public safety grade dispatch solution using NetScout nG1 (n-Genius One) and troubleshot the production issues with packet sniffer tools such as wireshark, tcpdump and log analyzer
· Certified BELL and TELUS’ Push to Talk App (available on Google Play & App Store) with features based on 3GPP Mission Critical Push-to-Talk (MCPTT) standards (Remote Monitoring and Emergency Services) using Integrated Web Dispatch Console resulting no more communication boundaries
· Managed QA team of 8 testers and developed over 1500 test cases for TELUS’ IMS / VoLTE / RCS Solution to provide Multi-Media and Rich Communication Suite services to its wireless customers according to IR 92, IR 94 / OMA / GSMA industry standards on various platforms comprising Apple iOS, Google Android, PC Windows & Mac
· Integrated and troubleshot cloud-based platform (UCCaaS) in a multivendor set-up to expand Rogers wireline coverage countrywide by interconnecting with 3rd party carriers through SBC (Session Border Controller) in Network-Network Interface (NNI) as IBCF (Interconnect Border Control Function).
Timeline
Design Specialist
TELUS
06.2022 - Current
Network Engineer
Bell Mobility
01.2019 - 01.2022
Network Designer
Rogers Communications
01.2016 - 01.2019
IMS / VoLTE Engineer
ERICSSON
01.2015
Applications QA Lead | Network Q/A Tester
TELUS
01.2013 - 01.2015
Quality Assurance Analyst
Bell Mobility
01.2012 - 01.2013
Senior Network Technician / Support
Legacy Leaders
01.2011
Telecom & Network Supervisor
Ecolog International FZE
01.2007 - 01.2011
Service & Support Engineer
Global Technical Systems, SAIF Zone
01.2004 - 01.2006
MCA - Computer Applications
Osmania University
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