#LI-DNI - Old TAR - LNT/EM-M-MS/ The TMMS & VoIP System Designer is responsible for the design, engineering, integration, testing, and maintenance support of Telecommunications Maintenance Management Systems (TMMS) and Voice over Internet Protocol (VoIP) systems for railway, metro, airport, and infrastructure projects.

The role ensures reliable communication, centralized monitoring, fault management, and maintenance of telecom systems in compliance with project specifications and industry standards.

Suitable for Railway, Metro, Airport, Data Centre, and Critical Infrastructure Telecommunication Projects.

Key Responsibilities -TMMS Design & Engineering

Develop Telecom Maintenance Management System architecture and design.

Define monitoring and control requirements for telecom subsystems.

Design interfaces between TMMS and telecom systems, including:CCTVPA/PIDSTelephone Systems

Radio Systems

Transmission Networks

Access Control Systems

Network EquipmentUPS Systems

Develop alarm management and event logging functionalities.

Configure SNMP-based network monitoring and management solutions.

Prepare telecom asset management databases and maintenance workflows.

VoIP System Design

Design IP-based telephony architecture and network topology.

Define SIP-based communication requirements.

Configure and integrate:IP-PBX SystemsSIP Servers

Media Gateways

VoIP Phones

Softphones

Voice Recording Systems

Develop dial plans, numbering schemes, and call routing interoperability with legacy telephone systems and emergency communication systems.

Integration & Interface Management

Coordinate with signalling, SCADA, AFC, ICT, and telecom teams.

Define interface requirements between TMMS, VoIP, and other railway systems.





Support integration activities during system implementation and commissioning.

Resolve communication and network interoperability issues.

Testing & Commissioning

Prepare Factory Acceptance Test (FAT) procedures.

Support Site Acceptance Testing (SAT).

Conduct functionality, performance, and redundancy testing.

Verify alarm reporting, fault management, and call quality requirements.

Support troubleshooting during commissioning and and maintain: System Design Documents (SDD)Telecom Architecture Drawings

Interface Control Documents (ICD)Network Diagrams

Bill of Materials (BOM)Configuration Documents

Testing Procedures and Reports

Operation & Maintenance Manuals

Compliance & Quality

Ensure compliance with project specifications and telecom standards.

Follow cybersecurity requirements for telecom and IP-based systems.

Support RAMS activities and system reliability assessments.

Participate in design reviews and audits.

Educational Qualification

Essential

Bachelor's Degree in: Electronics & Communication Engineering

Telecommunications Engineering

Preferred

Master's Degree in Telecommunications, Networking, or Systems Engineering.

Experience

Designer / Engineer8-15 years of experience in telecom system design and in railway, metro, airport, smart city, or infrastructure projects preferred.





Senior Designer / Lead Engineer8+ years of experience in telecom systems engineering.

Experience in managing telecom design and integration activities.

Technical SkillsTMMSTelecom Maintenance Management Systems

Network Management Systems (NMS)Fault Management Systems (FMS)SNMP Monitoring and Configuration

Alarm and Event Management

Asset Management Systems

VoIPIP Telephony ArchitectureSIP ProtocolRTP/RTCPVoIP Network DesignIP-PBX Systems

Session Border Controllers (SBC)Voice Recording Systems

Emergency Telephone Systems

NetworkingTCP/IPVLANVPNEthernet Switching

Routing Protocols

Cybersecurity Fundamentals

Network Redundancy Design

Knowledge of StandardsITU-T RecommendationsIEEE 802.3 Ethernet StandardsSIP (RFC 3261)IEC 62443 Cybersecurity StandardsISO 27001 Information SecurityEN 50121 (EMC for Railways)EN 50126 (RAMS)IEC 61375 (where railway network integration is required)Preferred Tools

Cisco Unified Communications Manager (CUCM)AVAYA IP Office

Unify/Open

Scape3CXAsterisk

Wireshark

Solar

Winds NMSPRTG Network Monitor

Manage

Engine OpManager

AutoCADVisioDOORS / Polarion

Key Competencies

Telecom System Engineering

VoIP Network Design

Troubleshooting and Problem Solving

Technical Documentation

Stakeholder Management

Interface Coordination

Communication Skills

Quality and Compliance Focus

Typical DeliverablesTMMS Architecture and Configuration Documents

VoIP System Design Documents

Interface Control Documents (ICD)Network Architecture DrawingsIP Addressing Plans

Device Configuration Sheets

Alarm & Event Mapping MatrixFAT/SAT Procedures and ReportsO&M; Manuals

As-Built Documentation

📌 Engineering Manager -Telecom Maintenance & Management System (India)
🏢 Larsen and Toubro
📍 India