Senior Network Support Specialist - Unified Communications

NTT DATA Global Delivery Services Ltd; Bengaluru; On-site; INR 2,800,000 - 4,000,000; Full time

Job summary

NTT DATA Global Delivery Services Ltd in Bengaluru seeks a Senior Network Support Specialist to lead Cisco UC deployments and operations across on-prem and hybrid environments. You will drive design, implementation, and upgrades for CUCM, Unity Connection, and SRST, while coordinating with vendors and internal teams.

The role requires CCNP Collaboration, strong routing/dial plan expertise, and hands-on experience with CUBE and voice gateways.

Qualifications

• Experience with CUCM design, deployment, and cluster management.
• Expertise with Unity Connection and Emergency Responder.
• Dial plan design including E.164 numbering & global route patterns.
• SIP trunk management with SRST site-survivability.
• Hands-on with CUBE and voice gateway deployments (TDM, PRI, SIP).
• Strong knowledge of VoIP protocols SIP/RTP/SRTP/MGCP/H.323.
• UC security best practices including SRTP/TLS and hardening.

Responsibilities

• Advanced UC administration: routing, numbering, feature configuration; own incidents; ensure DR/failover readiness.
• Support integrations with SBCs, gateways, PSTN providers, and UCCE in hybrid UC environments.
• Design and implement CUCM solutions; produce HLD/LLD docs for deployments and migrations.
• Enforce UC security measures; participate in E911 configuration & compliance audits.
• Plan and execute upgrades, migrations, and infra refresh projects.
• Define UC best practices, SOPs, and knowledge transfer for L1/L2 teams.
• Coordinate with Cisco TAC and carriers for escalations and post-incident reviews.

Skills

CUCM design

CUCM deployment

E911 & Unity Connection

Dial plan design

SIP trunk management

CUBE & voice gateways

UC security

SRST site‑survivability

Education

BE/B.Tech or MSc in IT/Telecom

Cisco CCNP Collaboration

CCIE Collaboration (preferred)

ITIL v4 Foundation

Tools

CUBE

Prime Collaboration

DNA Center

Voice gateways

Job description

Tcom - Network Support Senior Specialist – Bangalore, Karnātaka (IN-KA), India (IN)

Key Responsibilities

• Advanced UC Administration & Operations: Perform advanced call routing, numbering-plan optimization, and feature configuration (hunt groups, call queuing, call forwarding, call admission control); own complex incidents and problems escalated from L2, delivering RCA and permanent fixes; ensure compliance with UC redundancy, failover, and disaster-recovery strategies.
• Integration & Interoperability: Support integrations with SBCs, gateways (CUBE), PSTN providers, and contact center solutions (UCCE); ensure compatibility across hybrid UC environments (on-premises plus cloud UC such as Webex or Teams voice, where applicable).
• Architecture & Design Leadership: Design and implement Cisco UC solutions, including CUCM clusters, SRST sites, SIP trunking strategies, and dial plan configurations; produce HLD/LLD documentation for UC deployments and migrations.
• Security & Compliance: Enforce UC security measures and participate in E911 configuration and regulatory compliance audits.
• Upgrades & Migrations: Plan and execute version upgrades, product migrations (CUCM 12.x+), and infrastructure refresh projects.
• Governance & Documentation: Define UC best practices, SOPs, and knowledge-transfer documentation for L1/L2 teams.
• Vendor Coordination: Act as the primary liaison with Cisco TAC and carrier vendors for L3 escalations, service-request creation, and post-incident reviews.

Required Skills & Experience

• Deep hands‑on experience with Cisco Unified Communications Manager (CUCM), including design, deployment, and cluster management.
• Expertise administering Cisco Unity Connection (voicemail) and Cisco Emergency Responder (E911).
• Proven expertise in dial plan design (E.164 numbering, global route patterns, SIP normalization).
• Strong experience with SIP trunk management and SRST site‑survivability configuration.
• Hands‑on experience with CUBE (Cisco Unified Border Element) and voice gateway deployments (TDM, PRI, SIP).
• Strong knowledge of VoIP protocols: SIP, RTP, SRTP, MGCP, and H.323.
• Expertise in UC security best practices, including SRTP/TLS configuration and UC hardening.

Nice‑to‑Have Skills

• Experience automating UC provisioning (Python, PowerShell, Ansible) or using orchestration tools.
• Familiarity with UCCE (contact center) integrations.
• Knowledge of UC health‑monitoring tools (Prime Collaboration, DNA Center, or equivalent).

Education & Certifications

• BE/B.Tech, MCA, or equivalent degree in IT or Telecommunications.
• Cisco CCNP Collaboration required (or actively held) at this level; Cisco CCIE Collaboration (or written exam cleared) preferred; ITIL v4 Foundation an advantage.

About NTT DATA

NTT DATA is a $30 billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world's leading AI and digital infrastructure providers, with unmatched capabilities in enterprise‑scale AI, cloud, security, connectivity, data centers and application services. Our consulting and industry solutions help organizations and society move confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more than 50 countries. We also offer clients access to a robust ecosystem of innovation centers as well as established and start‑up partners. NTT DATA is a part of NTT Group, which invests over $3 billion each year in R&D. Whenever possible, we hire locally to NTT DATA offices or client sites. This ensures we can provide timely and effective support tailored to each client’s needs. While many positions offer remote or hybrid work options, these arrangements are subject to change based on client requirements. For employees near an NTT DATA office or client site, in‑office attendance may be required for meetings or events, depending on business needs. At NTT DATA, we are committed to staying flexible and meeting the evolving needs of both our clients and employees.

NTT DATA is an equal opportunity employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or protected veteran status.

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Experience Level Senior Level