Senior Network Specialist- VOIP & ACI

Cantellat Software; Singapore; On-site; SGD 120,000 - 240,000; Full time

Job summary

Cantellat Software in Singapore seeks a Senior Network Engineer/Specialist to design, implement, and manage voice transport and data center networks worldwide. Lead SIP, CUCM/CUBE, and Cisco ACI/Nexus ecosystems to support manufacturing and corporate operations.

You will optimize QoS, routing, and DR readiness, coordinating multi-site deployments and WAN/Cloud integration. Strong certifications and 10–20+ years of relevant experience are expected.

Qualifications

• 10–20+ years in enterprise network engineering with focus on voice transport and Cisco DC.
• Hands-on with Cisco ACI, Nexus platforms and DC fabric technologies.
• Strong experience with VoIP, SIP, SBCs, CUCM, CUBE and voice quality optimization.
• Deep knowledge of routing, QoS, multicast, and network performance engineering.
• Experience with Infoblox DNS/DHCP/IPAM and global multi-site networks.

Responsibilities

• Design, deploy, and support Voice Transport systems (SIP, RTP, SBCs, PRI) across global sites.
• Manage Cisco Collaboration platforms (CUCM, CUBE, Unity, IM&P) for enterprise voice.
• Maintain dial plans, call routing, QoS policies, codecs, and voice SLAs.
• Integrate voice with WAN/SD-WAN, MPLS, and cloud telephony platforms.
• Conduct voice traffic analysis, capacity planning, and performance tuning.
• Architect and operate Cisco ACI fabrics for data centers (multi-pod/site).
• Manage Cisco Nexus 9K/7K/5K, vPC, VXLAN, EVPN, spine-leaf architectures.
• Ensure high availability, redundancy, and disaster recovery for DC networks.
• Lead L2/L3 routing design using BGP, OSPF, EIGRP, MPLS, VRF.
• Implement QoS and traffic engineering for voice and data networks.
• Manage DNS/DHCP/IPAM platforms (Infoblox preferred).

Skills

Voice Transport

Cisco DC

VoIP

CUCM/CUBE/Unity/IM&P

SIP/VoIP protocols

Infoblox DNS/DHCP/IPAM

Tools

Cisco ACI

Cisco Nexus 9K/7K/5K

VXLAN/EVPN

BGP/OSPF/EIGRP/MPLS

vPC

Job description

Job title: Senior Network Engineer/Specialist

Job Location: Singapore

We are seeking a Senior Network Engineer/Specialist specializing in Voice Transport and Cisco Data Center technologies to support its global manufacturing, engineering, and corporate environments. The role is responsible for designing, implementing, and maintaining highly available voice and data center network infrastructure that supports enterprise operations, connected manufacturing plants, and mission-critical applications.

Roles & Responsibilities:

• Design, deploy, and support Voice Transport systems including SIP, RTP, SBCs, PRI gateways, and VoIP infrastructure across global sites.
• Manage and optimize Cisco Collaboration platforms (CUCM, CUBE, Unity, IM&P) for enterprise voice services.
• Maintain dial plans, call routing, QoS policies, codec strategies, and voice quality SLAs.
• Integrate voice systems with WAN, SD-WAN, MPLS, and cloud telephony platforms.
• Conduct voice traffic analysis, capacity planning, and performance tuning for manufacturing and corporate environments.
• Architect and operate Cisco ACI fabrics supporting enterprise data centers, including multi-pod/multi-site deployments.
• Manage Cisco Nexus platforms (9K/7K/5K), vPC, VXLAN, EVPN, and spine-leaf architectures.
• Ensure high availability, redundancy, and disaster recovery readiness for DC network services.
• Lead L2/L3 network design using BGP, OSPF, EIGRP, MPLS, VRF, and advanced routing policies.
• Implement QoS, traffic engineering, and performance optimization across voice and data networks.
• Manage DNS/DHCP/IPAM platforms (Infoblox preferred) for global network footprint.

Required Skills & Experience

• 10-20+ years of experience in enterprise network engineering with strong focus on voice transport and Cisco DC.
• Hands‑on expertise with Cisco ACI, Nexus platforms, and DC fabric technologies.
• Strong experience with VoIP, SIP, SBCs, CUCM, CUBE, and voice quality optimization.
• Deep understanding of routing protocols, QoS, multicast, and network performance engineering.
• Experience with Infoblox DNS/DHCP/IPAM.
• Proven experience supporting large‑scale, multi‑site enterprise networks (manufacturing/automotive preferred).
• Strong documentation and architecture skills.

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Preferred Certifications

• CCNP/CCIE (Routing & Switching, Data Center, Collaboration).
• Cisco ACI Specialist certifications.
• Voice/UC certifications (Collaboration track).

Interested candidates, willing to relocate to Singapore, may share your CV to [e-mail] for detailed discussion