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# Telephony Systems Administrator (SA1.5) (Government)

- **Company:** AT&T Inc.
- **Location:** Columbia, MD, United States
- **Experience:** Expert
- **Salary:** $89,200.0 - $129,400.0
- **Contract:** Permanent contract
- **Skills:** VoIP, Cisco Unified Communications Manager, Computer Networks, System Configuration, VMware ESX Servers, H.323 Protocol, Identity and Access Management, Virtualization Technology, Cisco
- **Published:** October 18, 2026
- **Apply:** https://www.disabledperson.com/jobs/76102607-telephony-systems-administrator-sa1-5-government

## About the Role

Join a mission-focused team supporting critical communications infrastructure. We are seeking a detail-oriented Telephony System Administrator who brings strong technical troubleshooting, security monitoring, and collaboration skills to help maintain reliable, compliant, and secure communications systems for customer operations.

This is a full-time onsite role based in the location(s) posted and is performed from the designated work location five days per week. No relocation is offered., Seven (7) years of experience as an SA in programs and contracts of similar scope, type, and complexity are required. Bachelor's degree in Math, Science, Engineering, Statistics, Engineering Management or a related discipline from an accredited college or university is required. Five (5) years of additional SA experience may be substituted for a Bachelor's degree.

 * Experience with the configuration and administration of common TDM and VOIP telephone call manager systems, such as the Nortel Meridian line of 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. Familiar with Cisco UCS platforms, voice gateways, virtualization, and ESXi.
 * DoD 8570 IAM Level 2 required.

## Description

* 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.
 * Provide support as needed to lower tier break/fix resolution and move/add/change/deactivation requests for all telecommunications systems.

Required Clearance: TS/SCI with polygraph. (#ts/sci) (#polygraph)