VoIP Engineer

Job description / Role

Job summary:

Our client is seeking a results-driven and technically adept VoIP engineer with over 4 years of hands-on experience in designing, deploying, and optimizing enterprise-grade VoIP solutions. The successful candidate will have demonstrated expertise in configuring SIP trunks, deploying and managing Session Border Controllers (SBCs), and maintaining complex IP PBX systems.

Key responsibilities:

• Design, deploy, and optimize VoIP solutions for enterprise environments
• Configure and manage SIP trunks with major service providers
• Deploy and manage Session Border Controllers (SBCs) for secure VoIP communications
• Maintain and troubleshoot complex IP PBX systems across various platforms, including:
  • Grandstream UCM
  • Yeastar S-Series
  • 3CX v20+
  • Asterisk FreePBX
• Troubleshoot call routing issues and implement dial plans
• Ensure network QoS for VoIP traffic and integrate voice solutions with legacy systems and modern unified communication environments

Required skills:

• SIP trunking (registration, authentication, NAT traversal)
• Session Border Controller (SBC) configuration & security
• IP PBX platforms (configuration and management)
• Call routing & dial plan logic
• VoIP protocols (SIP, RTP, SRTP, T.38)
• QoS and VoIP traffic shaping
• Number normalization and E.164 formatting
• Integration with PSTN gateways, VoIP phones, and softphones
• Network diagnostics & packet analysis (Wireshark, sngrep)
• VoIP monitoring & troubleshooting (logs, CDR, SIP traces)

Professional highlights:

• Successfully implemented SIP trunking and number porting projects across multi-site enterprise environments
• Migrated legacy PBX systems to IP-based platforms, achieving improved call quality and reduced telecom costs
• Deployed secure SBC configurations to support remote IP phones and NAT traversal for global teams
• Streamlined dial plans and outbound rules for diverse geographic and business needs
• Delivered training and documentation to IT teams and end-users on VoIP system usage and best practices

Requirements:

• 4+ years of experience in VoIP engineering
• Bachelor's degree (preferred)