Senior Voice / Collaboration Engineer

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 current 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

📌 Senior Voice / Collaboration Engineer (India)
🏢 Elfonze Technologies
📍 India