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Senior Network Engineer (VOIP)

CACI International Inc
United Statesfull_timeVerifiedPosted 13 Feb 2026
💰 $218,100/yr($103,800/yr$218,100/yr)

About the role

Job Title: Senior Network Engineer (VOIP)

Job Category: Information Technology

Time Type: Full time

Minimum Clearance Required to Start: TS/SCI with Polygraph

Employee Type: Regular

Percentage of Travel Required: Up to 10%

Type of Travel: Continental US

* * *

The Opportunity

CACI is looking for a VOIP Engineer to work as part of a collaborative, multidiscipline team in support of U.S. Government and provide technical expertise in the field of network engineering and VOIP.

Responsibilities

  • Design, implement, and maintain Local and Wide Area Networks (LAN/WAN).

  • Ensure robust and scalable network infrastructure aligned with client requirements.

  • Demonstrate advanced knowledge of TCP/IP protocols to ensure optimal network performance.

  • Troubleshoot and resolve complex network issues related to TCP/IP.

  • Engineer and implement voice and video solutions using platforms such as Cisco, Asterisk, and 3CX.

  • Configure and maintain VoIP protocols including SIP, RTP, and H.323.

  • Configure and troubleshoot LAN switches, routers, firewalls, and VPN concentrators.

  • Utilize tools like Wireshark for advanced troubleshooting of complex call routing issues.

  • Implement and maintain security measures such as Session Border Controllers (SBCs) and Transport Layer Security (TLS).

  • Integrate voice systems with cloud services to enhance functionality and reliability.

  • Convey technical designs, ideas, and results to non-technical audiences effectively.

  • Provide briefings and presentations to high-level government personnel.

  • Author comprehensive documents including reports, briefings, and technical documentation to support customer missions.

  • Maintain accurate and detailed records of network configurations and troubleshooting steps.

  • Apply the engineering design process to discover innovative methods to solve technical problems.

  • Demonstrate a proven ability to meet and exceed client requirements through creative solutions.

  • Work collaboratively with cross-functional teams to ensure seamless integration of network and voice solutions.

  • Provide ongoing support and maintenance for implemented systems, ensuring they meet performance standards.

Qualifications

Required

  • Strong background in Microsoft Systems Engineering and providing support to those systems.

  • Strong knowledge of virtualization products with a focus on Hyper-V.

  • Proficiency in scripting languages with a focus on PowerShell.

  • Experience with McAfee product suite.

  • Demonstrated capacity to understand and communicate technical ideas, concepts, and thoughts across multiple technical and non-technical stakeholders.

  • Demonstrated ability to independently determine and develop approach to solutions.

  • Must have knowledge of Cisco Routing and Switching, and network architecture planning.

  • Must have knowledge of remote administration and secure Virtual Private Networking.

  • Must understand commercial encryption standards and their application in IP networking.

  • Must have knowledge of VPN technologies, OSPF, EIGRP, BGP, IP Multicasting

  • Must have knowledge of voice and video solutions to include Cisco, Polycom, and Avaya configuration management and endpoint management including SIP and H.323 protocols.

  • 7-10 years of relevant experience designing communications systems. • Must have strong written and oral communication skills.

  • Excellent analysis and critical thinking skills

  • Ability to work independently as well as within small and large groups

  • Capable of preparing and presenting briefings

  • Experience with Microsoft Office product line, including Microsoft Access; experience with Lotus Notes

  • 8+with a Bachelors degree in Computer Science or related field (Equivalent experience may be substituted for educational requirement)

  • TS/SCI with Poly required

Desired Skills

  • Knowledge of Cisco and PolyCom VTC technology

  • An understanding of Private Branch Exchange telephony •

  • An ability to navigate and configure Linux operating systems

  • An understanding of wired data transport mediums to include Category 5e/6 and fiber optics.

  • Prior deployment to foreign field areas in support of customer mission

  • Prior experience communicating official traffic in the customer Electronic Messaging System (E

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Company

CACI International Inc

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