Senior Voice and Network Engineer

About the role

GDC IT Solutions is seeking a Senior Voice and Network Engineer to join our Managed Services team. This client-facing engineering position will be responsible for the design, implementation, administration, troubleshooting, and ongoing support of modern phone systems and related VoIP infrastructure for our managed-services customers.

Responsibilities

• Design, deploy, configure, and maintain phone systems for SMB and mid-market customers.
• Perform new phone system installations, upgrades, migrations, and system expansions.
• Provision and manage IP phones and other VoIP endpoints.
• Support common platforms including Yealink, Fanvil, Grandstream, Poly, and similar devices.
• Configure and troubleshoot VoIP-related firewall requirements.
• Work with firewalls including Fortinet, SonicWall, Meraki, WatchGuard, Palo Alto, and similar platforms.
• Troubleshoot SIP connectivity and interoperability issues with carriers and SIP providers.
• Perform network and packet-level troubleshooting using tools such as Wireshark and 3CX diagnostic tools.
• Monitor customer phone systems and proactively identify potential problems.
• Participate in on-call and escalation support as required.
• Serve as a Tier 3 escalation point for VoIP and 3CX-related issues.
• Configure and troubleshoot:
  • SIP trunks
  • SIP providers
  • SBCs
  • DIDs
  • Inbound and outbound call routing
  • IVRs and digital receptionists
  • Ring groups and queues
  • Call forwarding and routing
  • Voicemail
  • Auto attendants
  • Conference services
  • Call recording
  • Holiday and office-hour routing

Requirements

• 3+ years of hands-on experience with 3CX or comparable VoIP platforms.
• Strong understanding of SIP and VoIP technologies.
• Strong networking fundamentals including TCP/IP, VLANs, DHCP, DNS, NAT, routing, and QoS.
• Experience configuring and troubleshooting firewalls.
• Experience deploying and supporting IP phones.
• Experience troubleshooting VoIP call-quality issues.
• Strong analytical and troubleshooting skills.
• Ability to work independently on complex technical issues.
• Ability to communicate technical information effectively to both technical and non-technical customers.
• Experience working in an MSP or managed-services environment preferred.
• Ability to manage multiple customer projects and support issues simultaneously.
• Valid driver's license and ability to travel to customer locations as required.

Preferred Qualifications

• 3CX Basic or Advanced Certification
• 3CX Intermediate/Advanced training
• Experience with 3CX Hosted and/or self-hosted deployments
• Experience with 3CX SBC
• Experience with SIP trunk providers
• Experience with Microsoft Teams/Direct Routing
• Experience with Yealink, Fanvil, Grandstream, Poly, or similar phone systems
• Experience with Fortinet, SonicWall, Meraki, WatchGuard, or Palo Alto firewalls
• Experience with ConnectWise, Autotask, Kaseya, or similar MSP platforms
• Experience with Microsoft 365 and Entra ID
• Experience with Wireshark
• Network+ or CCNA
• Experience with Cisco, Aruba, Ubiquiti, or similar networking equipment
• Experience with PowerShell or basic scripting

Benefits

• Cutting Edge Technology and Innovation
• Career Growth Opportunities
• Employee-Centric Environment
• Comprehensive Benefits Package
• Holiday and Vacation