Freelance Session Border Controller Sbc Jobs (NOW HIRING)

Description

Leidos is seeking an experienced Voice / VoIP Architect to provide senior-level technical leadership, architectural oversight, and strategic direction for enterprise voice and unified communications services supporting NASA’s mission and corporate environments. This role is central to designing, evolving, and modernizing large-scale telephony platforms, including hybrid and cloud-based voice architectures and the transition from legacy Cisco environments to Microsoft Teams Telephony.

The selected candidate will serve as the lead architect for enterprise voice services, responsible for end-to-end design, integration, migration, and optimization of VoIP and unified communications platforms. This includes deep expertise in SIP-based communications, secure voice architectures, and large-scale, mission-critical deployments.

Key Responsibilities

• Lead architecture and design of enterprise voice and VoIP solutions across on-premise, hybrid, and cloud environments.
• Define and execute migration strategies from legacy PBX/Cisco UC platforms to Microsoft Teams Telephony.
• Architect SIP trunking solutions, including secure TLS/SRTP communications between enterprise platforms.
• Serve as the senior technical authority for voice call flows, signaling, and cross-platform interoperability.
• Design and implement Session Border Controller (SBC) architectures (Cisco CUBE, Oracle SBC, etc.).
• Ensure secure voice architecture including certificates, encryption, firewall traversal, and compliance requirements.
• Integrate voice services across LAN/WAN, SD-WAN, and cloud network environments with proper QoS and prioritization.
• Perform capacity planning and traffic analysis to ensure scalability, resiliency, and performance.
• Provide Tier 3 escalation support for complex VoIP, SIP, and gateway issues.
• Develop architectural standards, roadmaps, and lifecycle strategies for enterprise voice services.
• Deliver executive-level technical briefings and mentor engineering teams.

• Bachelor’s degree in Engineering, Computer Science, or related field (Master’s preferred).
• 10–15+ years of experience in enterprise voice/VoIP engineering or architecture.
• Proven experience supporting large-scale telephony deployments and migrations, including Cisco to Microsoft Teams Telephony.
• VoIP Protocols & Standards: Expert-level understanding of SIP, RTP/RTCP, H.323, and codec technologies (G.711, G.729, Opus).
• Networking Fundamentals: Strong knowledge of TCP/IP, VLANs, QoS, MPLS, SD-WAN, and routing protocols (BGP, OSPF) for voice traffic prioritization.
• Platforms & Vendors:
  • Cisco Unified Communications Manager (CUCM)
  • Cisco Unified Border Element (CUBE) / SBCs
  • Microsoft Teams Telephony
  • Experience with Avaya or similar enterprise voice platforms
• SIP & Security:
  • SIP trunk configuration (Cisco & Microsoft environments)
  • TLS/SRTP implementation
  • Certificate management and PKI
  • Firewall traversal and rule implementation
• Strong troubleshooting skills using protocol analyzers (SIP traces, packet captures, call flow analysis).

Preferred Qualifications
•    Experience with 

• Akkadian Provisioning Manager

• Oracle SBC

• Microsoft Survivable Branch Appliance (SBA)

• Cisco Unified Contact Center (UCCX/UCCE)

•    Security & Compliance: Familiarity with PCI, HIPAA, and secure voice recording requirements.
•    Hybrid/Cloud Voice: Experience designing hybrid VoIP architectures integrating on-prem PBX with cloud platforms (Microsoft Teams, Direct Routing).
•    Experience supporting government or NASA environments.
•    Active Secret Clearance.
•    Relevant certifications (e.g., Microsoft Teams Voice Engineer, CCNP Collaboration, etc.).

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

About Leidos

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits.

Securing Your Data

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com.

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.