Senior Voice / Collaboration Engineer

Elfonze Technologies; India; On-site; INR 3,000,000 - 6,000,000; Full time

Job summary

Elfonze Technologies is seeking a Senior Voice / Collaboration Engineer to implement, migrate and cutover Cisco voice environments. The role focuses on CUCM, SIP/CUBE, PSTN services, endpoint migration and carrier coordination across site-level dependencies.

The engineer will manage on-premises Cisco voice components, migrate devices, validate voice connectivity, and support large site cutovers with hypercare.

Qualifications

• 8+ years of experience in Cisco voice & collaboration
• Experience with CUCM, SIP/CUBE, PSTN services and endpoint migration
• Carrier coordination and site-level voice dependencies knowledge

Responsibilities

• Build and configure on-prem Cisco Unified Communications environment (CUCM Publisher/Subscribers, Unity Connection, CUBE)
• Configure SIP connectivity and call routing between CUCM, CUBE, carriers and voice systems
• Migrate and re-register VoIP endpoints into the new environment
• Coordinate with carriers for circuit activation, DID allocation and number porting
• Support site cutovers with pre-cutover validation and post-cutover validation

Skills

CUCM

Cisco Unity

SIP/CUBE

PSTN

Five9 integration

Voice routing

Dial peers

VoIP endpoints

Tools

Cisco IP Phones

CUBE/voice gateways

Job description

Job Description: Senior Voice / Collaboration Engineer
Job Description
Experience 8+ years
Primary Focus Local CUCM, SIP/PSTN, CUBE, Unity and site voice migration
Work Model Remote with onsite support for larger/critical site cutovers where required
Role Summary
Senior hands-on engineer responsible for implementation, migration and cutover of the local Cisco voice environment. The role requires deep experience with CUCM, SIP/CUBE, PSTN services, endpoint migration, carrier coordination and site-level voice dependencies.

Key Responsibilities / Implementation Scope

• Build and configure the local/on-premises Cisco Unified Communications environment, including CUCM Publisher and Subscribers, Cisco Unity Connection, CUBE/voice gateways, device pools, regions, locations, partitions, Calling Search Spaces, route groups, route lists, route patterns, translation patterns and dial plans.
• Configure and validate SIP connectivity and call routing between CUCM, CUBE, carriers, contact-center platforms and other voice systems.
• Support setup and testing of new SIP/PSTN services and coordinate with carriers for circuit activation, DID allocation, number porting and production service validation.
• Configure and troubleshoot CUBE and voice gateways, including dial peers, SIP profiles, codec negotiation, DTMF, RTP/SRTP, TLS, media flow and number manipulation.
• Migrate and re-register Cisco IP phones, softphones, conference devices and other VoIP endpoints into the NewCo voice environment.
• Configure and validate voice VLANs, DHCP options, DNS/NTP dependencies, QoS policies, gateway connectivity and network reachability required for voice services.
• Migrate DIDs, extensions, toll-free numbers, voicemail boxes, auto attendants, hunt groups, callforwarding rules and call-routing configurations.
• Support Five9/contact-center integration, including SIP connectivity, DID routing, inbound/outbound customer call flows, failover and end-to-end call validation.
• Validate and migrate analog lines, fax, paging/PA systems, emergency or site-specific voice dependencies where applicable.
• Execute site-by-site cutovers covering pre-cutover validation, endpoint migration, number-porting coordination, testing, rollback support, issue resolution and hypercare.
• Provide onsite implementation support for larger/critical sites and remote deployment support for smaller sites as required.
• Troubleshoot using CUCM RTMT, CUBE/IOS logs, SIP traces, packet captures, debugs and call-detail records.

Required Technical Skills

Area Required Hands-on Experience

Cisco Collaboration

CUCM Publisher/Subscriber, Cisco Unity Connection, Cisco IP Phones, devicregions, locations, partitions, CSS, route patterns, route lists/groups, translatipatterns and SRST concepts.

SIP / CUBE SIP trunks, dial peers, SIP profiles/normalization, DTMF, codec negotiation, RTP/SRTP, TLS, media flow and carrier integration.

PSTN / Numbering PSTN services, DIDs, toll-free numbers, number porting, inbound/outbound cand carrier coordination.

Network Dependencies Voice VLANs, DHCP, DNS, NTP, QoS, gateway connectivity, routing and pac troubleshooting.

Contact Center / Legacy Voice Five9 integration, analog gateways/lines, fax, paging/PA and site-specific teledependencies.

Migration & Cutover Site migration planning, cutover execution, rollback, testing, hypercare and as documentation.

Certification Requirements

Mandatory: Cisco voice/collaboration certification required. Acceptable senior credentials include Cisco Certified Specialist - Collaboration Core (350-801 CLCOR), CCNP Collaboration, or CCIE Collaboration.

Preferred / Advantageous: Relevant Collaboration concentration credentials such as CLACC/CLHCT and prior enterprise voice migration experience.

Required Deliverables

• Low-level design / configuration workbook
• Implementation runbook / Method of Procedure (MOP)
• Site cutover and rollback plans
• Voice test scripts and validation evidence
• As-built configuration and operational handover documentation