Nayeem Mohammed

Email: adzcxm@r.postjobfree.com; Mobile: 847-***-****

SUMMARY

9+ years of experience as SIP/VOIP Network Engineer with extensive experience and deep understanding of Converged data, Voice and Video technologies in multi-vendors’ environment

Expertise in SIP/ IMS /VOIP Technologies

Proficient in Telephony infrastructure and protocols - SIP, IMS, SBC CUCM MGCP, H.323 and Media Gateway

Extensive knowledge of IMS Core Elements, call flows and troubleshooting

Proficient in SIP End-to-End call flow tracing with detail analysis and monitoring skills,

Proficient in troubleshooting SIP messages at packet level using WireShark, IRIS Session Analyzer, MATS.

Hands on Experience in Audio and Video codes G.711, G.729. H.245, H.264,

Proficient in IOT between different Vendor Equipment, IMS registration/de-registration, E2E Call flow troubleshooting, VoLTE Call Forwarding, Call Waiting, hold/retrieve.

Proficient in installing, Configuration, troubleshooting and Administration of Cisco IP-PBX, Avaya IP-PBX and 3XC IP-PBX Communication servers

Troubleshoot end to end SIP call flow issues in enterprise market involving various VoIP elements. Key test areas for S-CSCF, I-CSCF, P-CSCF

IMS architecture (P-CSCF, I-CSCF, S-CSCF, HSS), capable of troubleshooting SIP issues on IMS Network

Strong Knowledge on SIP, Diameter Protocols, LTE interfaces and IMS Call Flows

Experienced in configuring and optimizing a IP-PBX telephone systems and services (IP Avaya PBX, Cisco IP-PBX and 3CX IP-PBX)

Experience in troubleshooting VoLTE call flows, audio quality, and network problems

Highly skilled in performing Functional, Regression, Performance, Stability and User Acceptance Testing (UAT) Defect tracking, Bug reporting.

Proficient in Microsoft Outlook, Excel, PowerPoint, Visio, MS Office 97/2000/2003, 2007/2010.

EDUCATION

Masters in Computer Information, Network Security (Chicago, USA) - 2013

Bachelors in Electronics in Communication Engineering (Hyderabad, India) – 2008

TOOLS

Wireshark, MATS, Quality test center, Shennik (load generator), VI Editor, EXFO, Application lifecycle Management HP-ALM, IRIS Session Analyzer, IXIA, Buganizer, Ads Telephony, ServiceNow, Remedy ticketing tool, Emperix Hammer, RTMT, Cobras, POSTMAN, TestRail, NetScout

EXPERIENCE

Sr. Voice Engineer

IMC Companies Memphis, TN 11/2022 – Present

Sills and Tools: SBC/Cube, SIP, CUCM, CER, Cisco Webex Calling,

Experience in Designing, installing, configuring, managing and troubleshooting CUCM & Cisco Unity Connection, Cisco IM and Presence (IM&P), Voice Mail and Cisco Emergency Responder (CER)

Experience in configuring SIP, H.323, MGCP voice protocol and troubleshooting Voice Gateways and SBC

Configured, Managed and Maintained Voicemails, Auto Attendants, E911, Phone Setup and Alarms/Alerts.

Proficient in Identifying and resolving the issues relating to Cisco IP phones, and voicemail such as, call forwarding issues, Voice Mail pin reset, MWI issue on CUC

Performed MACD's, Updated Bulk phones using Bulk Administration tool on CUCM

Proficient in Webex Control Hub and CUCM administration skills

Experience in installation, maintenance, and troubleshooting of Cisco VC hardware solutions i.e Webex Room and Room Kit products

Experience configuring Cisco 2XXX, 3XXX, 4XXX series routers along with Cisco IP phones 7945, 7965, 8831, 8841

Experience working on Agile methodologies to track and complete Project work.

Collaborate with IT And A/V teams to ensure effective communication and problem resolution

Maintained and updated Management applications such as CUCM and Webex Calling (Control Hub)

IMS Engineer

CSpire: Ridgeland, MS 10/2021 – 11/2022

Skills and tools: Diameter, SIP, IMS, CSCF, TAS, UDM, HSS, HLR, Linux, Bash Scripting, Wireshark, netScout

Experience in analysing logs and troubleshooting end to end Volte / PSTN/911 /voicemail call flow.

Experienced working on Mavenir IMS nodes including IPSMGW, P-CSCF, ASBC, TAS and CSCF.

Experienced in Netscout, Wireshark, SAS, PIC tool to analyse and troubleshoot issue

Test and Validated End to End E911 to PSAP call with Normal Registration with same APNs, Normal Registration with different APNs, without Normal Registration.

Validate E911 SIP call establishment with dedicated bearer for Voice Media

Execute system tests end to end to validate network elements.

Monitoring IMS KPI and send daily report.

Handle Volte/IMS trouble tickets and resolve within timeframe using JIRA Ticketing system.

Responsible for LAB testing and Production testing for IMS network.

Responsible for Lab and Production Mops to execute during Maintenance Window.

Experience in SIP, Diameter, GTPv2, S1AP Protocol.

Expert knowledge of Volte end to end call flow.

Validating traces on core nodes including PCSCF, CSCF, TAS

Validate Netscout trace LTE Network specially SGW and PGW.

Responsible for IMS software life cycle from Lab to Production.

Executed full acceptance test plan including Registration, VoLTE call, Voicemail, short code, conference call

Troubleshoot call flows, protocols and interfaces for IMS.

Knowledge of Volte architecture knowledge include PCRF / HSS / PGW / UE

SIP/VoIP Test Engineer

Nextiva Scottsdale, AZ 09/2020 – 09/2021

Skills and tools: Diameter, SIP, IMS, CSCF, TAS, UDM, HSS, HLR, Linux, Bash Scripting, Wireshark, http, RESTful web services

SIP Interop Testing between Nextiva App and Android, IOS, MAC and Windows

Executed XML scripts on POSTMAN tool for XSi (Xtended Service Interface) Actions and Events

Created and executed test cases for Thin Client, Call Center and SIP IOT.

Perform Software QA testing for Nextiva Application: Video and Audio Codecs.

Set up SIP Phones and test for Codecs on the payload for DTMF transmission to gateways.

Test customers Outbound Proxy Server on SBC connections to test customers IOT capability.

Worked on Codecs G.729A. G.711, G.722, G.722A, G.729, RTP, H.323, SCCP and Gateway

Tested all the features of Broadsoft like Barge-in, calling line ID blocking, N-way conference, call park and Retrieve, call pull on Nextiva Application/Softphone, Cisco Broadsoft Web Interface Administration

Experience working on TestRail tool, Writing and Executing test cases

Configure Call Center setting on Broadsoft to use Call Center for Broadsoft Agent, Broadsoft Supervisor, Broadsoft Receptionist-Enterprise, Broadsoft Communicator

Configure Audio/Video Codec on Broadsoft to test the calls between Different vendor equipment.

Cisco UC one Communicator for desktop features testing like Voice/Video calling, Desktop sharing, call Park/Retrieve, call Pull, N-way Conference, call Forward, Transfer Broadsoft call settings.

Configured Tags on Broadsoft to Enable/Disable features and Tested against Nextiva Platform.

Network Engineer

Marathon Petroleum San Antonio, TX 09/2019 – 08/2020

Skills and tools: Diameter, HSS, Linux, Bash Scripting, Wireshark, UCM, Call Center

Migrated Telephony Cluster (CUCM, CUC) from ver. 10.5 to ver. 12.5 with 20 sites located throughout US consisting of 2500+ Phones and 55+ Gateways with T1/PRI & POTS(FXO,FXS) lines

Configured and Tested Emergency Call Handler on Call Manager to provide essential Emergency Call Features (E911) along with Emergency Location (ELIN) group for particular site or location

Performed MACD's, Updated Bulk phones using Bulk Administration tool on CUCM

Configured Cisco Phones such as 7945, 7965, 8831, 8841 and Cisco 43xx and 44xx Routers in Enterprise Network.

Provided Level-3 Operational support to users utilizing CUCM 10.5/12.5 & Cisco Unity 10.5/12/5

Tested E911 to verify routing and connectivity to ensure correct location information is provided to the Emergency dispatcher after changes or upgrade to the Call Manager.

Installed, configured and administered Cisco IP-PBX Communication servers.

Troubleshoot any technical issues relating to phone extensions in Cisco IP-PBX

Configured extensions on Cisco IP-PBX and proficient in configuring Cisco softphones

Configured and optimized a IP-PBX telephone systems and services

Provided support for VOIP Infrastructure and associated software for IP-PBXs, Call management systems, Voice Mail and IVR (Interactive Voice Response)

Configured, Managed and Maintained Voicemails, Auto Attendants, E911, Phone Setup and Alarms/Alerts.

Configured Audio codec such as G.711, G.722 and G.729 on Cisco IP phones

Configured IOS Gateways with H323, SIP and MGCP and SIP Trunks on CUCM

Performed E911 Tests for 933 Dialing to ensure correct calling number and Emergency location address is sent to Public Safety Answering Point (PSAP)

Tested E911 Live call and validated Emergency Location Information with PSAP Operator.

Proper coordination with cisco TAC for any issues

Configured CUCM with Side Car, Speed Dial, Device Pool, MRGL (Media Resource Group list), dial plan with calling restrictions by using a combination of Calling Search Spaces CSS, Partitions, Translation Patterns and translation profiles

Proficient in Identifying and resolving the issues relating to Cisco IP phones, and voicemail such as, call forwarding issues, Voice Mail pin reset, MWI issue on CUC

Network Voice Engineer

Google Inc Hyderabad, India 07/2017 – 08/2019

Skills and tools: Diameter, SIP, SDP, HSS, Linux, Bash Scripting, Wireshark

Provide L3 support for Google Cloud Platform Infrastructure (Google Hangout, Ads Telephony)

Provide a resolution to trouble tickets on Baganizer tool without breaching SLA

Test SIP call features like call-forwarding, Call hold, call transfer, music on hold

Capturing SIP logs using Google Admin tool to identify issues and isolate accordingly

Analyze SIP messages to narrow down call failure and escalate it to the carriers/aggregators

Identify and isolate Porting-in and Porting-out of Google Network issues.

Troubleshoot end to end call flows for one way audio, poor audio quality for Google Hangout Call.

VoIP Test Engineer

Comcast Moorestown NJ 06/2016 – 06/2017

Skills and tools: Diameter, SIP, SDP, HSS, Linux, Bash Scripting, Wireshark

Design and Documented IMS Network solution and services including call flows.

Implemented and Tested IP Multimedia Subsystem(IMS) End-to-End Call flows issues

Tested End to End calls between IMS to IMS call, IMS to PSTN call

Performed Audio and Video codec testing on different vendor IP Phones (Avaya, Polycom, Cisco) within LAB Environment.

Hands on experience in debugging and troubleshooting of P/I/S-CSCF servers in IMS core network.

Capture and Analysed Diameter Messages between Access SBC and Multimedia Policy Engine (MPE)/Camiant Server to make sure Admission Authentication Request (Rx AAR) and Authorization (Rx AAA) is transmitted correctly

Verifying channel gates on CMTS server to meet QOS of audio and video calls

Deployed Session Border Controller (SBC) Platform in Lab Environment

Configured ACME 9200 SBC to exert control over the Signalling such as Topology hiding, NAT traversal & Transcoding.

Execute Regression, Sanity, Functional, performance test cases and update test results on HP-ALM

Identify and Report Bugs identified during testing and work with Development team towards the completion of Identified bugs.

SIP Test Engineer

ZVRS LLC Clearwater FL 11/2015 – 05/2016

Skills and tools: Diameter, SIP, SDP, HSS, Linux, Bash Scripting, Wireshark

Performed Interoperability testing for Cisco DX70 with ZVRS and other vendor equipment

Develop test procedures, execute test cases and create test reports.

Work with Development team to isolate issues encountered during tests, provide valuable feedback to enhance call features and functionalities based on test results.

Configured and supported legacy Avaya PBX solutions (PRI, Analog, Digital)

Engineering and supported IP Avaya PBX solutions (VOIP, SIP (station and trunking), H323)

Configured 3CX IP-PBX to support 100+ phones

Proficient in configuring and troubleshooting any issues relating to 3CX IP-PBX

Tested Audio codecs G.711 and G.729 between ZVRS and different vendor IP Phones

Worked collaboratively with IT, Operations, Customer Service and Business teams in prioritizing requirements

Monitor call registration to Media server and isolate any issues encountered during registration.

WebEx Engineer

Cisco Systems San Jose CA 02/2014 – 10/2015

Skills and tools: Diameter, SIP, SDP, HSS, Linux, Bash Scripting, Wireshark

Manual testing of all Webex features after a bridge build such as Telephony Call-in, Call-out, mute, unmute, desktop sharing, video sharing, Voice and Video recording.

Upgraded Linux servers to newer version using Linux commands

Configured Media Server, application server and Created XML files

Running Shell scripts on different servers to check the performance and collecting logs for analysis.

Executing Regression test cases and submitting test results

Worked back and forth with development team to implement changes according to the requirement

Tested complex software and web applications

Worked in Software Quality Assurance team for various product testing.

Junior Network Engineer

Aarzee Enterprises Inc. Chicago, IL 03/2013 – 01/2014

Skills and tools: TCP/IP, DNS, DHCP, Wireshark

Responsible for Designing, maintaining and troubleshooting all network related issues.

Identify user needs and assigning limited access, evaluate and modify system’s performance

Adding new hosts machines to the network both wireless and wired machines via MAC filtering on Routers

Installing antivirus software on hosts machines, updating windows Operating System, applying new patches and bug fixes

Contact this candidate