Voice Network Engineer

Abacus Technology Corporation; Belleville (IL); On-site; USD 100,000 - 140,000; Full time

Job summary

Abacus Technology Corporation is seeking a Voice Network Engineer to support a Scott AFB enterprise program. This full‑time role focuses on tier 3 engineering for voice networks and Cisco VoIP systems.

The candidate will configure CUCM, Unity, and SBCs, develop SIP connections, and collaborate with internal teams. A Bachelor’s degree and CCNP Collaboration are required, along with U.S. citizenship and Top Secret clearance.

Qualifications

• 5+ years in VoIP/telecom engineering.
• Bachelor’s degree in a related field.
• CCNP Collaboration certification.
• Hands-on experience with switches/routers.
• Experience with Cisco CUCM and Cisco Unity.
• Able to work with all organizational levels.
• U.S. citizen with Top Secret clearance.

Responsibilities

• Provide tier 3 engineering and support for voice and communications networks.
• Configure, patch, STIG, and enhance Cisco VoIP systems including Call Manager and Unity.
• Develop configurations for SIP connections and SBCs to external networks.
• Integrate SIP between VoIP network and customer networks such as Asterisk and Call Manager Express.

Skills

VoIP engineering

Cisco CUCM

Cisco Unity

Network hardware

Education

Bachelor's degree in related field

Tools

CCNP Collaboration

Job description

Overview

Abacus Technology is seeking a Voice Network Engineer to provide infrastructure support of communications networks for an enterprise program at Scott AFB. This is a full‑time position.

Responsibilities

• Provide tier 3 engineering and support for voice and communications networks.
• Configure, develop, patch, STIG, enhance, and add features to Cisco VoIP systems, including Call Manager, Cisco Unity, Ribbon VX900 devices, instant messaging, presence, and teleconference bridges.
• Develop configurations and methods for Cisco Unified Border Elements, Session Border Controllers, and other network devices that use Session Initiated Protocol (SIP) to connect the system to external voice systems.
• Develop configurations for SIP connections between the VoIP network and other customer networks, including Asterik networks, Call Manager Express, SRST, and other Cisco VoIP networks.

Qualifications

5+ years experience in a VoIP or telecommunications engineering role; Bachelor’s degree in a related field; Must be CCNP Collaborations certified; Hands‑on experience with physical network infrastructure (switches, routers); Extensive experience with Cisco tools and technologies, including Cisco Unified Call Manager (CUCM) and Unity; Experience with network implementation and maintenance; Ability to demonstrate flexibility in adjusting to variable workload and job duties; Ability to interact professionally with all levels of an organization; Must be a U.S. citizen and hold a current Top Secret clearance.

Applicants selected will be subject to a U.S. government security investigation and must meet eligibility requirements for access to classified information.

EOE/M/F/Vet/Disabled