Voice Network L2 Engineer

Tata Consultancy Services; Doha; On-site; QAR 180,000 - 280,000; Full time

Job summary

Tata Consultancy Services (MEA) in Doha, Qatar, seeks a Voice Network L2 Engineer / VoIP Specialist to manage advanced troubleshooting, incident restoration, and RCA for enterprise voice services.

The role focuses on SIP/RTP, ISDN PRI, and SIP trunk configurations, coordinating with OEMs and carriers, and ensuring QoS for voice traffic in a complex telecom environment.

Qualifications

• Experience with SIP/RTP/VoIP call control
• Strong knowledge of PRI/ISDN signaling
• Hands-on troubleshooting of voice network issues
• Ability to perform RCA and CAPA actions
• Experience coordinating with OEMs and carriers

Responsibilities

• Troubleshoot SIP call failures, call drops, and audio issues.
• Lead incident restoration for P1/P2 incidents.
• Analyze SIP/RTP signaling and call flows for root causes.
• Perform RCA for outages and implement CAPA.
• Support voice routing changes and trunk configurations.
• Coordinate with vendors (Cisco, Avaya, Ribbon, Audiocodes).
• Monitor call quality KPIs and suggest QoS tuning.
• Provide guidance to L1 team and improve SOPs.
• Lead major incident bridges and ensure timely resolutions.

Skills

VoIP SIP

RTP/RTCP

ISDN PRI

VoIP codecs

SIP tracing

Vendor coordination

Tools

Wireshark

NMS/EMS tools

CLI troubleshooting

ServiceNow/ Remedy

Job description

Job Title – Voice Network L2 Engineer / VoIP Specialist

Company – TCS (MEA)

Location – Doha, Qatar

Job type – Full time

About Us

Tata Consultancy Services (TCS) is an IT services, consulting and business solutions organization that has been partnering with many of the world’s largest businesses in their transformation journeys for over 50 years. TCS offers a consulting-led, cognitive powered, integrated portfolio of business, technology and engineering services and solutions. This is delivered through its unique Location Independent Agile™ delivery model, recognized as a benchmark of excellence in software development. A part of the Tata group, India's largest multinational business group, TCS has over 616,171 of the world’s best-trained consultants with 157 nationalities in 53 countries. For more information, visit www.tcs.com and follow TCS news at @TCS_News.

Job Description

1. 1. Advanced Troubleshooting & Fault Isolation Perform deep-dive troubleshooting for: SIP call failures, call drops, one-way/no audio issues PRI/E1 link issues (LOS, LOF, slips, framing errors) SBC (Session Border Controller) issues Softswitch / IMS-related signaling failures Analyze: SIP call flows (INVITE, BYE, REGISTER, etc.) RTP media path issues (latency, jitter, packet loss) Identify problem domain: Core voice network Customer CPE / IP-PBXCarrier interconnect Access/backhaul network
2. 2. Incident Resolution & Service Restoration Own and resolve P1/P2 incidents escalated by L1Drive restoration within defined MTTR targets Perform: Call flow tracing and log analysis SIP ladder analysis and debugging PRI circuit validation and diagnostics Lead troubleshooting during major voice outages
3. 3. Protocol & Signaling Expertise Strong working knowledge of: SIP, RTP, RTCPISDN PRI (Q.931 signaling) VoIP codecs (G.711, G.729, etc.) Analyze: Registration issues Call routing misconfigurations Codec mismatch / negotiation issues
4. 4. Root Cause Analysis (RCA) Perform detailed RCA for: Call drops / failure spikes Recurring voice congestion Intermittent quality degradation Identify root causes such as: Network congestion / jitter Misconfiguration Routing / dial plan issues ISP/carrier-related faults Provide Corrective & Preventive Actions (CAPA)
5. 5. Change & Implementation Support Validate and support: Voice routing changes SIP trunk configuration updates PRI migrations / provisioning Softswitch / SBC upgrades Perform impact analysis, pre-checks, post-validation, and rollback planning
6. 6. Vendor & Carrier Coordination Coordinate with: OEMs (Cisco, Avaya, Ribbon, Audiocodes, etc.) SIP/PRI carriers and service providers Handle TAC/vendor escalations Track resolution and ensure timely closure
7. 7. Performance & Quality Management Monitor and analyze: Call success rate (ASR, ACD) Call quality KPIsPacket loss, jitter, latency Identify and resolve chronic voice quality issues Suggest optimization: QoS tuning Bandwidth optimization Routing improvements
8. 8. L1 Support & Technical Governance Provide technical guidance to L1 team Validate L1 troubleshooting and escalations Enhance: SOPsKnowledge base articles Troubleshooting frameworks
9. 9. Major Incident Management Lead bridge calls for critical outages Drive coordination across: Network teams Carriers Enterprise customers Ensure: Timely updates Impact assessment Quick restoration

Required Technical Skills

Core Voice Expertise

Strong knowledge of: VoIP / SIP / RTP protocols PRI / ISDN signaling IP Telephony & Call Control IMS / Softswitch architecture

Networking Knowledge

TCP/IP, subnetting, routing basics Understanding of: QoS (voice prioritization) MPLS/Internet transport impact on voice

Tools & Platforms

Experience with: NMS/EMS tools Packet capture tools (Wireshark preferred) CLI-based troubleshooting Ticketing tools (Service Now/Remedy),

Application Deadline: 20-Sep-2026 Privacy Note:https://www.tcs.com/connect-with-tcs/privacy-policy