Senior Cisco Voice Engineer

VTG; Sterling (VA); On-site; USD 120,000 - 160,000; Full time

Job summary

VTG seeks an experienced Cisco Voice Engineer to design, deploy, and sustain enterprise Cisco Unified Communications solutions in a highly secure government environment. Responsibilities include CUCM/Unity/IM&P/UCCX/UCCE deployments, call routing, SIP trunking, PKI management, and collaboration with multiple teams.

The role requires a TS clearance with polygraph, a bachelor’s or master’s degree in a related field, and at least six years of progressive Voice/UC engineering experience.

Qualifications

• Top Secret Clearance with Polygraph is required.
• 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, Google Cloud Platform, 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.

Responsibilities

• Design, test, and deploy 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.

Skills

SIP signaling

SRTP

Cisco UC

VoIP

TCP/IP networking

MPLS

DNS

DHCP

Call routing

UCCX/UCCE

DoD/IC security

Stakeholder comms

Education

Bachelor's or Master's degree in Computer Science, IT, Engineering, or related field

Tools

CUCM

Unity Connection

IM&P

UCCX

UCCE

PKI management

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, MGoogle Cloud Platform, 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