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 recent 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

📌 Senior Voice (India)
🏢 Elfonze Technologies
📍 India