VoIP Administrator - FreeSwitch

Job Title: VoIP System Administrator Department: IT Managed Support Services Location: Mexico City Mexico’s SAT : Registered with (Tax Administration Service). Should have a Mexican RFC tax ID. Position Type: Full-Time Language : Fluent English (Required) Currency : Paid in MXN VoIP System Administrator (FreeSWITCH / FusionPBX) Location: Remote (Mexico) Experience Level: Intermediate (4–6 years) About the Role We are looking for a VoIP System Administrator to support and evolve our hosted VoIP and unified communications platforms. This role is ideal for someone who enjoys working hands-on with FreeSWITCH, FusionPBX , and SIP-based telephony, while also engaging in real-world troubleshooting , customer onboarding, and secure VoIP deployments. You will be responsible for managing production VoIP environments, supporting customer phone systems, deploying IP phones remotely, and collaborating with networking and security teams to ensure high availability, performance, and call quality. Key Responsibilities Administer, maintain, and monitor FreeSWITCH / FusionPBX or equivalent VoIP platforms Configure and support multi-tenant VoIP environments Provision, configure, and remotely deploy Yealink IP phones (and similar vendors) Manage SIP trunks, extensions, dial plans, call routing, IVRs, voicemail, and failover Troubleshoot call quality issues (latency, jitter, packet loss, echo) Perform packet analysis using Wireshark to diagnose SIP/RTP issues Work closely with firewall and network configurations (NAT, SIP ALG, port forwarding) Assist with customer onboarding, migrations, and VoIP cutovers Monitor system health, logs, CDRs, and service availability Document configurations, procedures, and customer deployments Participate in incident response and service restoration when required Required Technical Skills Hands-on experience with: FreeSWITCH FusionPBX (or strong FreeSWITCH-based systems) Strong understanding of: SIP, RTP, UDP/TCP NAT traversal and VoIP firewall rules Experience deploying and managing: Yealink IP phones (Auto-Provisioning, firmware, templates) Network troubleshooting skills: VLANs, QoS, firewalls, VPNs Packet capture and analysis using Wireshark Linux administration experience (Ubuntu / Debian preferred) Experience working in MSP or hosted VoIP environments Nice-to-Have Skills Experience with: Kamailio or OpenSIPS SBCs and SIP security hardening Knowledge of: TLS / SRTP Multi-region VoIP deployments Exposure to: Cloud or private data center environments Monitoring tools and alerting systems Previous customer-facing or managed services experience Soft Skills & Attributes Strong troubleshooting mindset and attention to detail Comfortable working independently and in small technical teams Ability to explain technical concepts to non-technical users Organized, documentation-driven approach Calm under pressure during service incidents What We Offer Opportunity to work with modern, privately hosted VoIP infrastructure Exposure to enterprise and regulated environments A technical, no-nonsense engineering culture Competitive compensation based on experience