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
