Voice Over Internet Protocol Technician

General information

Requisition # R67725 Locations USA-MD-Annapolis Junction Posting Date 05/13/2026 Security Clearance Required TS/SCI w/ Poly Remote Type Onsite Time Type Full time

Description & Requirements

Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we’ve been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now—unleash your potential with MANTECH!

MANTECH seeks a motivated, career and customer-oriented Voice Over Internet Protocol (VOIP) Technician to join our team in Annapolis Junction, MD. The VOIP SME is responsible for supporting Cisco Unified Call Managers for a global footprint in addition to POTS lines, both supporting e911 services in support of the Government customer.
 

Responsibilities include but are not limited to:

• Provides broad telephony support from administrator level configurations to in-depth technical solutions for critical clients over nonsecure networks.
• Works as the SME for engineers, surveyors, installers, and project managers to develop and execute end-to-end solutions for vendor products including Session Border Control and/or CUBE.
• May manage multiple communication projects that provide critical response efforts resulting in streamline services for analog and digital.
• Provides administration to voicemail servers, call managers, and emergency responders involving T1, fiber, Ethernet, multiplexing, copper wrap, and cellular servicing.
• Configures and troubleshoots multi-vendor hardware and software systems.
• Engages support for the escalation and communication of status to agency management and internal customers.
• Support clients across multi-level service platforms, executing in-depth solutions to resolve real-time incidents and requests.
• Provide support to TCP/IP network protocols that rely on TCP, Session Initiation Protocol, session description protocol, and VoIP codecs to provide reliable service. .
• Monitor, tune, and support basic existing telephone systems and network infrastructure to ensure stable, reliable, secure, and efficient communications operations.
• Support Identification, assessment, and development of detailed requirements such as supporting re-architecture of network segments in order to facilitate new requirements, technologies and growth.
• Support lien mitigation efforts related to maintaining a compliant System Security Plan and associated network security and communicate effectively with a wide variety of technical and non-technical audiences, including customers, team partners, and other staff members.
• Travel is required in support of service requirements -- 5-20%. This position also offers opportunities to support other bodies of work, at different locations, and to travel both CONUS and OCONUS (no hostile areas)

Minimum Qualifications:

• 6 years of relevant experience
• IAT Level 2 certification which may include Security+ CE, SSCP or CCNA
• Understanding of high-level network routing and managing SIP trunking
• Experience with VOIP systems to include the planning, design, installation, maintenance, management, and coordination of the deliverable
• Understanding of IT equipment and service life as well as planning and implementation of equipment replacement
• Experience creating presentations with the ability to convey technical and business concepts to various audiences
• Ability to handle complex customer situations and interact with all levels of personnel to provide a quick and effective resolution

Preferred Qualifications:

• Ability to support network devices such as servers, switches and routers
• Advanced CISCO certifications
• Experience with large scale enterprise IT contracts

Clearance Requirements:

• Must have a current/active TS/SCI w/ Poly
   

Physical Requirements:

• The person must be able to handle IT of a reasonable nature without assistance.  Move about inside the office to collaborate with other leaders/teams, use standard office automation equipment, and virtual communication, which may involve delivering presentations.

The projected compensation range for this position is $85,000.00-$141,600.00. There are differentiating factors that can impact a final salary/hourly rate, including, but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories.  In addition, MANTECH invests in its employees beyond just compensation.  MANTECH’s benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, short-term and long-term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections.
MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with MANTECH, please email us at careers@mantech.com and provide your name and contact information.