Summary
Overview
Work History
Education
Skills
Certification
Patents
Timeline
Generic

Suresh Tummala

Littleton,CO

Summary

Experienced with voice network architecture, ensuring seamless communication solutions. Utilizes advanced troubleshooting techniques and system optimization to enhance performance—knowledge of integrating various voice systems and maintaining robust network reliability.

Overview

16
16
years of professional experience
1
1
Certification

Work History

Principal Voice Engineer

Dish Wireless
11.2021 - Current
  • Lead and mentor the engineering team to deliver reliable voice services to DISH customers over the new 5G /Nokia IMS network deployed on AWS cloud.
  • Ensure team-members stay up to date by providing frequent training,job aids on the new VOIP technologies,system architectures and troubleshooting procedures.
  • Configured and optimized SIP/VOIP call routing and trunking
  • Collaborate with Product and Customer Service teams to understand customer needs and build reliable solutions and deliver better products.
  • Extract, filter, aggregate and analyze voice call CDRs using SQL
  • Recommend strategies to the business teams on market opportunities and voice service plans/tariffs.
  • Actively contribute to network improvements and participate in innovation, lessons learned, and knowledge sharing activities as a Subject Matter Expert (SME).
  • Capacity Management : Evaluate future traffic loads and determine voice interconnection changes, including establishing voice peering arrangements.
  • Monitor,classify and analyze voice network traffic to optimize performance and ensure optimal functionality and user experience.
  • Leads technical and end-to-end solution design for voice networks.
  • Accomplished implementing Stir-Shaken solution into IMS network to deal with Robo and Spoofed calls and validate with SIP Peering Carriers.
  • Assessed organizational needs to recommend appropriate hardware, software, and network components for optimal voice communications infrastructure.

VOIP Engineer III

Bandwidth
05.2018 - 10.2021
  • Acquired proficiency in CPaaS service that enables enterprises to create, scale and operate voice services.
  • Assessed system architectures including reliability and redundancy requirements.
  • Performed software and hardware patching and upgrades on voice platforms to maintain operational integrity and compliance.
  • Simulate and troubleshoot SIP call flows using FreeSWITCH
  • Diagnosed and resolved Ribbon gear (SBC,PSX and EMS) ,WebRTC and call failures including 911 emergency calls as a Tier4 on-call support engineer.
  • Configured and deployed SWe SBCs on Red Hat Enterprise Linux(RHEL) KVM hypervisor.
  • Carried out Production VOIP network Maintenance activities including SBC upgrades and config changes to fix voice call routing issues.
  • Served as Interrupts engineer on a monthly basis to troubleshoot call failures,customer outage and answer network related questions from other internal teams.
  • Automated the SBC maintenance activities including pre and post-checks with Rest APIs and Python scripting.
  • Monitored network performance and ensured enough capacity for the future loads.

VOIP Engineer

Comcast
09.2012 - 03.2018
  • Load shared the third-party service provider's originated voice traffic onto the available Comcast SBCs using ConteXtream Load Balancer(LB).
  • Installed/Upgraded Load Balancers and configured SNMP traps on LB towards SBCs to get the CPU capacity and active calls and INVITE Rate statistics.
  • Provisioned and tested SBCs, MGCFs for Comcast to third-party off-net calls, Comcast to peer-network calls routing, and updated ENUM and BGCF routes accordingly.
  • Configured NENA SBC for routing 911 emergency calls on Intrado/TeleCommunication Systems (TCS) as VPCs and terminating calls on Comcast MGCF to PSAP. Also provisioned backup routes for emergency calls via Verizon and Qwest peers.
  • Configured SBC with DNS/ENUM for resolving domains or E164 telephone numbers and DIAMETER for billing.
  • Analyzed VOIP network elements' performance KPIs using SevOne.
  • Troubleshoot call routing failures using SBC debug logs, Wireshark, and IRIS packet capture tools, and automated SBC tasks with Shell scripts.
  • Regression, Failover, and Load tested SBCs, MGCF, MGW using SIPp, Spectra2, and EXFO traffic generators.

NOC Engineer

Reliance Communications
12.2008 - 08.2012
  • Performed day-to-day Nation Network Operations and handled Soft Switch using Plexview and Access Switch (DLC) Network using Netman NMS (Network Management System) and EMS (Element Management System)
  • Spearheaded and monitored the alarms of circuit Switch (AXE-10), Alcatel-Lucent soft switch (NGN) hardware, and software-related issues.
  • Fault management using the Clarity OSS Application.
  • Tracked and reported the Bugs using Bugzilla and ADN Debug Tool, and interacted with the Vendor team to fix the bugs.
  • Rectified various hardware software software-related faults for Ericsson switches (AXE10 TL 4.2 version, APZ 212 30), Alcatel-Lucent soft switch (NGN), which are being used to provide VOIP, NLD, ILD, and Basic Services, to minimize the Network’s MTTR.
  • Conducted Operational Acceptance Tests (OAT) on Alcatel-Lucent VOIP/TDM Gateways to support the SIP Protocol before integrating the equipment into the network.
  • Analyzed SIP calls using Wireshark and packet capturing tools.

Education

Batchelors - Electronics & Communication Engineering

JNTUniversity
Hyderabad,India
05.2008

Skills

  • Solution Design & Architecture
  • SIP signaling and call flows
  • STIR/SHAKEN
  • SIP,RTP/SRTP,WebRTC,SS7,HTTP,NGAP
  • Network Performance KPIs
  • Nokia,Ribbon/Sonus and ORACLE/ACME Session Border Controllers,MGCF,MGW
  • REST,SOAP APIs
  • On-Call support
  • 5G,IMS Packet Core
  • 911 Call routing
  • Python and Shell scripting,SQL
  • TCP,UDP,TLS,DNS,DIAMETER,RTCP,DNS,DHCP
  • AWS EKS,EC2,S3,CloudFront,WAF
  • Linux/Unix
  • Splunk,Grafana Monitoring Tools
  • Voice traffic Capacity Management
  • KVM and VMware
  • 3rd party vendor assessment
  • OSS/BSS systems
  • Codecs AMR-WB ,G711, G722, G729

Certification

  • AWS Solution Architect Associate
  • SSCA -SIP School Certified Associate
  • Ribbon SBC ,PSX Engineering Professional

Patents

Application#18403906: Dynamic modification of communication operations exchanged between interconnected networks.

Application#18404005: Dynamic modification of error mapping operations during communication operations.

Timeline

Principal Voice Engineer

Dish Wireless
11.2021 - Current

VOIP Engineer III

Bandwidth
05.2018 - 10.2021

VOIP Engineer

Comcast
09.2012 - 03.2018

NOC Engineer

Reliance Communications
12.2008 - 08.2012

Batchelors - Electronics & Communication Engineering

JNTUniversity

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