Telephony Systems Administrator – SA1.5

AT&T

. Provide overall system administration for an enterprise-wide Cisco Unified Communications Manager and related systems .

Posted 10/16/2026full-timeColumbia • Maryland • United StatesSeniorLead💰 $89,200 - $129,400 per yearWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in system administration for Cisco Unified Communications Manager and related systems, with a strong focus on performance monitoring, documentation, and maintenance of telecommunications infrastructure. Holds relevant certifications and possesses extensive experience in managing voice network structures and configurations.

Highest-signal resume keywords

Cisco Unified Communications Manager AdministrationTDM And VOIP Telephone Call Manager SystemsDoD 8570 IAM Level 2 CertificationTS/SCI With Polygraph ClearanceLarge-Scale Implementation Experience

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

System AdministrationConfiguration ManagementVoice Network DesignPerformance MonitoringDocumentation MaintenanceTraffic Route AnalysisBreak/Fix ResolutionDial Plan AdministrationH.323 KnowledgeSIP Knowledge

Tools & Technologies

Cisco Voice SystemsNortel Meridian PBXsCisco UCS PlatformsVoice GatewaysVirtualizationESXi

Certifications & Qualifications

DoD 8570 IAM Level 2TS/SCI With Polygraph Clearance

Industry Keywords

Telecommunications SystemsGovernment Customer OperationsMulti-Cluster EnvironmentSLA AttainmentMaintenance Tasks

Tech Stack

Tools & technologies

TypeScriptVoIP

About the role

Key responsibilities & impact

Provide overall system administration for an enterprise-wide Cisco Unified Communications Manager and related systems
Plan regular maintenance tasks, including updates and upgrades
Maintain current and accurate documentation of system configurations
Design, administer, and analyze corporate dial plans and traffic routes for voice network structure
Administer and monitor voice systems for performance and SLA attainment
Support lower-tier break/fix resolution and move/add/change/deactivation requests for telecommunications systems
Support critical communications infrastructure for government customer operations

Requirements

What you’ll need

Seven (7) years of experience as an SA in programs and contracts of similar scope, type, and complexity
Bachelor’s degree in Math, Science, Engineering, Statistics, Engineering Management or a related discipline from an accredited college or university, or five (5) years of additional SA experience substituted for a Bachelor’s degree
TS/SCI with polygraph clearance
DoD 8570 IAM Level 2
Experience with configuration and administration of common TDM and VOIP telephone call manager systems, including Nortel Meridian PBXs and Cisco Unified Call Manager
Large-scale implementation experience with Cisco Voice in a multi-cluster environment and data networking infrastructure
Working knowledge of H.323 and SIP
Familiarity with Cisco UCS platforms, voice gateways, virtualization, and ESXi
Ability to work onsite five days per week in Columbia, Maryland
No relocation offered

Benefits

Comp & perks

Medical/Dental/Vision coverage
401(k) plan
Tuition reimbursement program
Paid Time Off and Holidays (at least 23 days of vacation each year and 9 company-designated holidays)
Paid Parental Leave
Paid Caregiver Leave
Additional sick leave beyond what state and local law require may be available
Adoption Reimbursement
Disability Benefits (short term and long term)
Life and Accidental Death Insurance
Supplemental benefit programs: critical illness/accident hospital indemnity/group legal
Employee Assistance Programs (EAP)
Extensive employee wellness programs
Employee discounts up to 50% off on eligible AT&T mobility plans and accessories, AT&T internet (and fiber where available) and AT&T wireline phone
No relocation is offered