VoIP Administrator - FreeSwitch

Confidential

Not specified contract

Posted: January 30, 2026

Required Skills

Job Description

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

Why Apply Through MisuJob?

AI-Powered Job Matching: MisuJob uses advanced artificial intelligence to analyze your skills, experience, and career goals. Our matching algorithm compares your profile against thousands of job requirements to find positions where you have the highest chance of success. This saves you hours of manual job searching and ensures you only see relevant opportunities.

One-Click Applications: Once you create your profile, applying to jobs is effortless. Your resume and cover letter are automatically tailored to highlight the most relevant experience for each position. You can apply to multiple jobs in minutes, not hours.

Career Intelligence: Beyond job matching, MisuJob provides valuable career insights. See how your skills compare to market demands, identify skill gaps to address, and understand salary benchmarks for your experience level. Make data-driven decisions about your career path.

Frequently Asked Questions

How do I apply for this position?

Click the "Register to Apply" button above to create a free MisuJob account. Once registered, you can apply with one click and track your application status in your dashboard.

Is MisuJob free for job seekers?

Yes, MisuJob is completely free for job seekers. Create your profile, get matched with jobs, and apply without any cost. We help you find your dream job without any hidden fees.

How does AI matching work?

Our AI analyzes your resume, skills, and experience to understand your professional profile. It then compares this against job requirements using natural language processing to calculate a match percentage. Higher matches mean better fit for the role.

Can I apply to jobs in other countries?

Absolutely. MisuJob features jobs from companies worldwide, including remote positions. Filter by location or look for remote opportunities to find jobs that match your preferences.

Ready to Apply?

Join thousands of job seekers using MisuJob's AI to find and apply to their dream jobs automatically.