Voice Network L2 Engineer

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:

Key Responsibilities

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-PBX
• Carrier interconnect
• Access/backhaul network

2. Incident Resolution & Service Restoration

• Own and resolve P1/P2 incidents escalated by L1
• Drive 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. Protocol & Signaling Expertise

• Strong working knowledge of:
• SIP, RTP, RTCP
• ISDN PRI (Q.931 signaling)
• VoIP codecs (G.711, G.729, etc.)
• Analyze:
• Registration issues
• Call routing misconfigurations
• Codec mismatch / negotiation issues

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. 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. 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. Performance & Quality Management

• Monitor and analyze:
• Call success rate (ASR, ACD)
• Call quality KPIs
• Packet loss, jitter, latency
• Identify and resolve chronic voice quality issues
• Suggest optimization:
• QoS tuning
• Bandwidth optimization
• Routing improvements

8. L1 Support & Technical Governance

• Provide technical guidance to L1 team
• Validate L1 troubleshooting and escalations
• Enhance:
• SOPs
• Knowledge base articles
• Troubleshooting frameworks

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 (ServiceNow/Remedy),

Application Deadline: 20-Sep-2026

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