Senior Cisco Voice Engineer with Security Clearance

VTG; Sterling (VA); On-site; USD 120,000 - 180,000; Full time

Job summary

VTG is seeking an experienced Cisco Voice Engineer to design, deploy, secure, and sustain Cisco Unified Communications in a high-security government environment.

The role emphasizes SBCs, SIP trunks, SRST, CUBE, and UCCX/UCCE, with DoD clearance and advanced Cisco certifications highly valued.

Qualifications

• Top Secret Clearance with Polygraph is required.
• 6+ years of progressive Voice/UC engineering experience.
• Expert-level in SIP signaling and call flows.
• Expert-level in SRTP, SIP, MGCP, and H.323.
• CCNP Collaboration preferred, CCIE Collaboration desirable.

Responsibilities

• Design, test, and deploy Cisco Voice infrastructure (CUCM, Unity Connection, IM&P, UCCX).
• Implement next-gen voice system technologies and support first article engineering.
• Support security accreditation activities for all voice systems.

Skills

SIP signaling

SRTP

TCP/IP networking

MPLS

Call routing

Job description

Overview We are seeking experienced Cisco Voice Engineers to support a mission critical, technology driven program for a key Government customer. This role focuses on designing, deploying, securing, and sustaining enterprise level Cisco Unified Communications solutions across a complex, highly secure environment. What will you do?

• Design, test, and deploy new Cisco Voice infrastructure (CUCM, Unity Connection, IM&P, UCCX).
• Implement next generation voice system technologies and support first article engineering.
• Participate in security accreditation activities for all voice systems.
• Manage PKI/certificate requirements across Cisco UC components.
• Perform system upgrades, patching, and lifecycle maintenance for hardware and software.
• Provide engineering support for new site standups, including dial plan design and endpoint provisioning.
• Design, test, and deploy call center technologies (UCCX/UCCE), including user training and transition planning.
• Execute tasks related to call routing, SIP trunking, SRST, CUBE, and gateway configuration.
• Collaborate with customers and internal teams to gather and refine system requirements.
• Ensure compliance with enterprise standards, policies, and security procedures.
• Work within a large scale enterprise IT environment with responsibilities specific to Cisco Voice and Unified Communications.
• Partner with network engineering and telecom teams on integration activities involving telephony, call center systems, and network infrastructure.
• Support secure communications devices and infrastructure, including VoIP phones, STEs, Viper phones, encryption devices, POTs/ISDN/leased lines, conference bridges, and call management servers. Do you have what it takes?
• Must have a Top Secret Clearance with Polygraph
• Bachelor's or Master's degree in Computer Science, IT, Engineering, or related field
• Minimum of six (6) years of progressive experience in Voice/UC engineering
• Expert-level proficiency in SIP signaling and call flows
• Expert-level proficiency in Secure Real Time Transport Protocol (SRTP)
• Expert-level proficiency in SIP, MGCP, and H.323
• Expert-level proficiency in TCP/IP networking
• Expert-level proficiency in MPLS transport environments
• Expert-level proficiency in DNS and DHCP
• Expert-level proficiency in RTP media handling
• Demonstrated experience leading enterprise-scale voice deployments and modernization efforts
• Proven ability to troubleshoot complex, multi-layered call routing and signaling issues
• Strong communication skills for stakeholder engagement, documentation, and technical leadership Preferred Education, Experience, & Skills:
• Expertise in SIP signaling, call flows, and multi-vendor integration
• Hands-on experience with H.323 in mixed protocol environments
• Cisco Certified Collaboration Professional (CCCP) or equivalent Cisco Collaboration certifications
• CCNP Collaboration certification
• CCIE Collaboration certification (highly desirable)
• Avaya Communications certification or experience supporting Avaya platforms in hybrid Cisco/Avaya environments
• Experience with secure communications devices such as VoIP endpoints, STEs, Viper phones, and encryption devices
• Familiarity with government security accreditation processes and PKI/certificate management
• Experience designing or supporting call center technologies (Cisco UCCX/UCCE or Avaya equivalents)
• Prior experience in a DoD, IC, or other high-security environment