Job Description

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Tower Lead - Avaya (Telecommunications)
India

Tower Lead - Avaya (Telecommunications)
Lucknow, Uttar Pradesh
Job Summary
5 to 10 years of years of Telecom Voice and services experience. Must have expert level knowledge and experience managing all TDM Domestic, International & VoIP/Voice switching systems. Very good knowledge and experience of all Voice International switches like DMS100, DMS250, DMS500, CS2K/PVG, DEX600, SONUS, 5ESS (class 3 and 5), C20/G9, Siemens/EWSD, Ericsson AXE. Good knowledge of Local POTS lines, ISDN PRI, Metro Private line, Frame Relay, Channel Banks, Multi-Point and Ringdown circuits. Knowledge of 911 services, knowledge of all order entry and provisioning systems. Expert knowledge of technologies such as OSI model layer 1-7 troubleshooting, SIP, SS7, IP routing protocols, ISDN PRI, Local and LD voice switch/network including DS-0, DS-1, and DS-3 Bandwidth circuits. A very good understanding of call flow routing and translations over carrier international networks, International Toll Free, Advanced IP Toll Free Routing (ATF), Digital Voice, Wireless, Conferencing, International IDDD, and International Toll Free, as well as other Repair Center products. Experience troubleshooting issues include but not limited to, poor call quality, call completion failures, call routing, feature interoperability and connectivity issues across CPE, Sonus SCIP, VoIP Public, Private, International and PSTN networks. Strong technical background in the TDM and VoIP voice and data technologies Preferred areas of configuration and troubleshooting technical proficiency include: OSI model layer 1-7 troubleshooting, SIP, SS7, IP routing protocols, ISDN, Frame Relay/MPLS/ATM, Local and LD voice switch/network including DS-0, DS-1, and DS-3 Bandwidth circuits. Functional knowledge of specialized diagnostic tools (packet capture/protocol analysis devices), SIP protocol, firewalls, session border
Key Responsibilities

• 5 to 10 years of Voice and/or VoIP technical support experience.
• Deep understanding on how different Voice solutions are integrated. Have good understanding on products like Retail VoIP, Enhanced Toll-free services, XO VoIP, Webex Calling, VoIP MACD
• Understand how Cisco Web-ex, Global IP Connect, Genesys Contact center and VZ Global conferencing interact with VoIP/IP Toll Free, PSTN and Verizon PIP cloud networks works.
• Have good understanding and knowledge on IP Trunking , IP Integrated Access, IPTF Term, TDM Voice products, SBC.
• Understanding on MPLS deployments connecting to PSTN and understanding on major components like PIP & IDA SBC, BSAS/BSNS, NS/RS, Sonus DSCIP, CS2K, C20/G9, OCCAS, Sonus NBS gateway.
• Good understanding on VoIP call flows like Inbound Call path, Inbound Call path with SIP ladder, Registered User Inbound & Outbound Call Flow, IP Integrated Access (IPIA) Key - Outbound & Inbound Call flow, IP Trunking (Enterprise Trunk) inbound & Outbound Call flow, Basic IP Toll Free Call Flow, IPIVR Toll Free Call Flow, Basic Inbound local Origination..etc.
• Ability to troubleshoot complex issues.
• Strong communication skills and ability to interact with different types of stakeholders
• Knowledge of network standard analysers such as Wireshark and SIP ladder diagrams.
• Ability to prioritize and multi-task independently.

Skill Requirements

• You will be responsible for end-to-end trouble isolation and repair for customers voice products experiencing complex issues across CPE, LAN, WAN and PSTN networks
• Troubleshoot issues related to quality, completion, routing, interoperability and connectivity across local, long distance, and IP networks.
• Troubleshoot different layers in the OSI model. Understand and leverage network topologies and workflows.
• Work with SS7 signalling and strong foundations of SIP/RTP messaging and call flows.
• Engage with general router functionality such as router configurations, troubleshooting commands, etc.
• Keep up-to-date with technology changes and continually expand knowledge and skill sets.

Other Requirements
1. Optional But Valuable Certifications: Avaya Certified Implementation Specialist (Acis), Avaya Certified Support Specialist (Acss)
Information at a Glance
Why HCLTech?
At HCLTech, you'll supercharge your potential. You'll find your career. And you'll find your spark. All at a place that knows that helping its customers stay on top starts by putting its people first.
HCLTech is a global technology company, home to more than 226,300 people across 60 countries, delivering industry-leading capabilities centered around digital, engineering, cloud and AI, powered by a broad portfolio of technology services and products. We work with clients across all major verticals, providing industry solutions for Financial Services, Manufacturing, Life Sciences and Healthcare, Technology and Services, Telecom and Media, Retail and CPG, and Public Services. Consolidated revenues as of 12 months ending December 2025 totaled $14.5 billion.
23 Benefits At HCLTech, we believe in empowering our employees with comprehensive benefits that support their professional growth and enhance their well-being. When you sign up for a career with us, you gain access to: https://rmkcdn.successfactors.com/147eb21f/a701dca9-f32d-4fc9-9447-6.svg Industry-benchmarked compensation https://rmkcdn.successfactors.com/147eb21f/b0c54381-ddcc-4a33-9b35-9.svg Best-in-class healthcare benefits https://rmkcdn.successfactors.com/147eb21f/b73027be-7aae-4d36-a090-4.svg Personal time off https://rmkcdn.successfactors.com/147eb21f/d5b4fdfd-2e99-4e26-9878-9.svg Maternity and paternity benefits https://rmkcdn.successfactors.com/147eb21f/3d42b0fc-4652-435a-9ece-c.svg Access to skills / higher education programs/resources https://rmkcdn.successfactors.com/147eb21f/aeddeaf2-9e25-4584-ad11-d.svg Discounts on products and services via Benefit Box https://rmkcdn.successfactors.com/147eb21f/a9609a3b-2700-4b3c-9d90-a.svg Participate in CSR programs and live life with a purpose https://rmkcdn.successfactors.com/147eb21f/c6e33851-710f-4634-bd69-f.svg Opportunities to grow and advance your career Note: The benefits listed above vary depending on the nature of your employment and the country where you work. Some benefits may be available in some countries but not in all.
Copyright 2025 HCL Technologies Limited
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Skills Required