The Role
Senior hands-on engineer responsible for designing, configuring, migrating, and troubleshooting on-premises Cisco voice and collaboration environments. Responsibilities include CUCM, Unity Connection, CUBE, SIP/PSTN services, Cisco endpoints, Five9 integration, network dependencies, carrier coordination, number porting, site cutovers, rollback planning, testing, documentation, and hypercare. The role is primarily remote with onsite support for larger or critical migrations.
Summary Generated by Built In
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
Skills Required
- 8+ years of relevant voice and collaboration engineering experience
- Hands-on experience with CUCM Publisher and Subscribers, Cisco Unity Connection, Cisco IP Phones, dial plans, partitions, calling search spaces, route patterns, and SRST
- Hands-on experience with SIP trunks, CUBE, dial peers, SIP profiles, DTMF, codec negotiation, RTP/SRTP, TLS, media flow, and carrier integration
- Experience with PSTN services, DIDs, toll-free numbers, number porting, inbound and outbound calling, and carrier coordination
- Experience with voice VLANs, DHCP, DNS, NTP, QoS, gateway connectivity, routing, packet troubleshooting, and network dependencies
- Experience integrating Five9 or other contact-center platforms with enterprise voice environments
- Experience with analog gateways and lines, fax, paging or PA systems, and site-specific voice dependencies
- Experience planning and executing site migrations, cutovers, rollback, testing, hypercare, and documentation
- Mandatory Cisco voice or collaboration certification, such as Cisco Certified Specialist Collaboration Core, CCNP Collaboration, or CCIE Collaboration
- CLACC or CLHCT collaboration concentration credentials
- Prior enterprise voice migration experience
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The Company
What We Do
Elfonze Technologies is a Bengaluru-based technology and engineering services company that helps organizations modernize enterprise operations. Its offerings include Oracle ERP and enterprise applications, cloud and DevOps services, digital transformation, product engineering, connected supply-chain solutions, AI platforms, cybersecurity, staff augmentation, and managed solutions. The company serves global clients through IT consulting, technology delivery, and specialized supply-chain expertise, emphasizing innovation, operational excellence, and business-process improvement.
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