VoIP Engineer Job Descriptions, Average Salary, Interview Questions

What Does a VoIP Engineer Do?

VoIP engineers oversee and engage in the design, implementation, support, troubleshooting, maintenance, and upgrading of Voice over Internet Protocol systems. They ensure VoIP connections function with the speed and clarity necessary for high quality telephony communications. VoIP engineers must possess a deep understanding of the technology and be proficient with the current hardware and software tools necessary to fix issues that arise.

VoIP engineers most commonly work either in an office environment for a large corporation supporting internal technology, or for a manufacturer of VoIP systems and solutions. They also work as consultants, designing new VoIP networks, or solving technical challenges for existing ones.

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National Average Salary

VOIP engineer salaries vary by experience, industry, organization size, and geography. To explore salary ranges by local market, please visit our sister site zengig.com.

The average U.S. salary for a VOIP Engineer is:


VOIP Engineer Job Descriptions

The first step when hiring a great VoIP engineer is a well-crafted job description. Below are real-world examples to help give you the best chance of success on your recruiting journey.

Example 1

We are seeking a VOIP engineer to design, implement, and support our internal VOIP system. This position will work with the IT department to create a unique system that ushers in new capabilities for productivity. They will be responsible for VOIP hardware and software. To be successful in this position, you must have a bachelor’s degree or higher from an accredited college or university with major coursework in telecommunications technology, electronics engineering technology, electrical engineering technology, computer science, information systems management, and other related fields.

Typical duties and responsibilities

  • Install equipment to facilitate integration with our intranet
  • Provide advice on how to configure network switches for optimal functionality
  • Troubleshoot hardware problems
  • Research software updates to increase capacity and optimize performance
  • Design, implement, test, and support the daily operations of our VOIP system
  • Identify short-term goals to increase productivity in communications infrastructure
  • See that all equipment functions are optimized for efficiency
  • Perform network analysis to improve security and prevent future failures or downtime
  • Research new technologies to stay abreast of field developments

Education and experience

  • A bachelor’s degree in telecommunications, electronics engineering technology, computer science, information systems management, or a related field is required for this position
  • 6 to 10 years of work experience in the IT industry with two or more years of VOIP expertise
  • Excellent knowledge of IP networks and technologies such as NAT, DHCP, DNS, VLAN, MPLS, and WAN
  • Strong background in TCP/IP networking specifications, performance improvement techniques, network management tools, and methodologies
  • Working knowledge of network topologies such as LANs, WANs, MANs, and wireless networks
  • Knowledge of Open Source VOIP solutions is a plus
  • Working knowledge of scripting languages such as Perl, PHP, and C++ is a plus

Required skills and qualifications

  • Strong knowledge of network protocols and networking technologies
  • Ability to work with common programming languages
  • Capacity to learn new programming languages
  • Advanced skills for troubleshooting problems related to networks
  • Knowledge of Linux and Windows systems, including shell scripting languages
  • Knowledge of TCP/IP
  • Basic knowledge of Cisco Systems, Juniper Networks, and other telecommunication networks architecture

Preferred qualifications

  • Knowledge of Java, XML Technologies, and VoIP protocols, including SIP and RTP
  • Experience with signaling protocols such as H.323 or MGCP
  • Excellent knowledge of Python
  • Experience with network protocols such as PANA, DHCP, and DNS
  • Exceptional analytical skills

Example 2

Being part of the NTT Data group enables ABC Company to offer a wider range of solutions and services through increased capacity, as well as technological, geographical, and financial resources.

ABC Company is looking for high-achieving team players that are quickly adaptable to new challenges and entrepreneurial ventures. We are currently seeking a VoIP Network Engineer for our client in (City, State).

  • We want to incorporate the resource, as soon as possible
  • Position is to work onsite at client facilities in (City, State)
  • This is a long-term contract position


  • Act as Subject Matter Expert on VoIP communications, based on Cisco Technologies
  • Collaborate in VoIP projects. Currently there is an Ongoing project for Call managers consolidation and migration to platform 12.5
  • Be part of L3 support for the Networking team in a Multitiered support team


  • 5+ years’ experience in IT VoIP with Cisco VoIP Technologies
  • CCNA or CCNP (preferable 350-801 CLCOR)
  • Onsite presence in (City, State) office
  • Ability to work autonomously and manage client expectations
  • Effective interpersonal, written and verbal communications skills
  • Outstanding organization, time management, and interpersonal skills
  • Proactive documentation of work

Knowledge of

  • VoIP infrastructures based on Cisco Unified Communications design and management
  • Switching, routing
  • Familiar with ticketing systems like IT Now

Example 3


Responsible for providing day-to-day administration, operation, maintenance, troubleshooting, and support for an advanced voice and network system across all ABC Company’s sites. Provides engineering support for the VoIP network infrastructure and UC services to include TDM and IP-based trunking, voice routing design, configuration, and unified messaging. Serves as an escalated Tier 3 resource for customer incidents and work orders for network services and voice network infrastructure devices. Provide cross-training and mentoring across Tier 1/2 engineering team. Supports the engineering and project management teams by performing the voice communications aspects of medium to large sized projects from inception to completion including technical assessments, design, planning, integration, testing, and implementation. Creates and maintains technical documentation (network designs, SOPs, User Guides, etc. ) in support of both direct customer education and the technical knowledgebase. Must have experience on Cisco Routers, Structured Cabling, and LAN/WAN circuits; PRI, SIP, MPLS, FXO, FXS, and POTS. Must possess advanced knowledge of the Cisco Unified Call Manager, IMP, Telepresence, IPCC, Unity, CCX, SRST, CUBE, secure voice concepts, and secure voice processes.

Must possess in-depth experience in the design, configuration, long-term planning, operational support, and project management of large telecommunication systems and associated data networks. Advanced experience supporting unified collaboration tooling preferred.

Required education/experience

  • Bachelor’s degree in Computer Science or a related field OR equivalent combination of education and experience that demonstrates competency
  • 5 years functional experience in supporting Voice Operations and/or Voice Engineering
  • Per the driver’s license requirement noted below, must have a driving record acceptable to Risk Management

Required credentials

  • Current State Driver’s license

Preferred qualifications

  • Certification on Cisco voice systems

Knowledge, skills and abilities

  • Advanced knowledge of VLANs, switchport configuration, layer two networking, and QOS
  • Advanced knowledge of the following protocols: SIP, MGCP, H.323, SCCP
  • Strong analytical and problem-solving skills
  • Good communication and interpersonal skills
  • Ability to achieve customer satisfaction by maintaining SLA’s for call quality, uptime, and resolution of high-priority incidents
  • Able to effectively use required tools and equipment
  • Able to recognize and solve typical problems related to Voice Communications systems
  • Able to establish and maintain effective working relationships with staff and vendors
  • Able to work with changing work priorities and deadlines

Example 4

ABC Company is seeking an experienced VOIP Engineer with a Public Trust Clearance to support XYZ and our government customer in (City, State).

Essential functions, responsibilities & duties may include, but are not limited to:

  • Meeting with IT managers to determine the company’s networking needs
  • Analyzing existing VoIP networks and computer systems
  • Developing architecture plans for voice and data services
  • Installing network hardware modules including IP and PBX communication servers
  • Designing and implementing VOIP systems
  • Support Legacy Siemans PBX during transition
  • Manage transition from legacy Siemans PBX to VOIP network
  • Troubleshooting VoIP network issues
  • Analyzing and upgrading network security systems and protocols
  • Adding network users and managing company permissions
  • Optimizing network installations for future expansion
  • Training staff on network and system protocols

Work experience, knowledge, skills & abilities:

  • Bachelor’s degree in information technology, computer science, or a similar field
  • 10 years Previous experience working as a VoIP network engineer
  • Preferred CCNA, CCNP
  • In-depth knowledge of VoIP systems and IP Protocols
  • Knowledge of hardware systems including servers, memory modules, processors, and peripherals
  • Detailed knowledge of network security systems and software
  • Good project management skills
  • Familiarity with WAN and LAN systems
  • Excellent troubleshooting skills
  • Advanced written and verbal communication skills

Working environment & conditions

This position is primarily indoors, consistent with a standard office position and has a noise level of mostly low to moderate. The incumbent is required to stand; walk; sit; use hands to finger, handle, or feel objects, tools, or controls; reach with hands and arms; talk and hear. The workload may require the incumbent to sit for extended periods of time. The incumbent must be able to read, do simple math calculations, and withstand moderate amounts of stress. The incumbent must occasionally lift and/or move up to 25 lbs. Specific vision abilities required by the job include close vision, distance vision, color vision, depth perception, and the ability to adjust focus.

Candidate Certifications to Look For

  • CompTIA Network+ – This certification helps candidates develop a career in IT infrastructure by covering troubleshooting, configuring, and managing networks. CompTIA Network+ validates the hands-on skills needed to troubleshoot, configure, and manage both wired and wireless networks.
  • CompTIA Security+ – This is the first security certification IT professionals should earn. Candidates will have the ability to establish the core knowledge required for any cybersecurity role. This certification provides a springboard to intermediate-level cybersecurity jobs. 
  • Cisco CCNP Collaboration – Achieving CCNP Collaboration certification proves a candidate’s skills with collaboration solutions. To earn this certification, candidates must pass two exams: covering core collaboration technologies and collaboration concentration. They will have a choice of which exams to take, so their certification can be customized to their technical area of focus.
  • Certified Wireless Network Professional (CWNP) – The only vendor-neutral wireless LAN certification program in the industry, which will cover the full range of technologies underlying all enterprise WLAN products. This is another great option for VOIP engineers.

How to Hire a VOIP Engineer

When hiring a VOIP engineer, first consider the following:

  • Recruiting: Do you have the knowledge, tools, and resources to attract and screen candidates?
  • Complexity: Do you need a senior professional, or will mid or junior-level skills and experience suffice?
  • Duration: Is this a one-time project or an ongoing need?
  • Management: Do you have the time and expertise to direct the work effectively?
  • Urgency: How soon does the work need to be completed?
  • Headcount: Do you have the budget and approval for an internal employee, or should you consider alternate options?

Answering these questions will help determine the best course of action for your current hiring need. Fortunately, great options exist for every scenario. These are our recommendations:

1. Use 4 Corner Resources (or another professional recruiting firm)

The heavy lifting is done for you when working with a top-tier staffing company like 4 Corner Resources. We source, screen, recruit, and deliver only the most qualified candidate(s), saving you significant time and effort throughout the hiring process while you remain focused on your core business. Understanding your needs and ensuring the right candidate for the position is the key to our success.

This is the best route to take when:

  • You need to fill the position quickly
  • You want access to a vast talent pool of high-quality, prescreened candidates
  • Your position is suited for temporary hiring services, contract staffing, or contract-to-hire recruiting, and you intend to direct the work activity.
  • You are hiring an employee as a direct placement but aren’t able to recruit effectively or efficiently with your internal staff. 
  • You aren’t familiar with current salary rates, market trends, and available skill sets
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2. Advertise your opening on a top job board

Your best option may be to advertise your opening on a proven job board. There are many widely used job sites out there that draw visits from qualified candidates. If you have someone internally who can dedicate the time and energy to sort through applications and screen individuals effectively, this can be a great choice. 

We recommend using a job board when:

  • Your internal recruiting team has the knowledge and experience to assess candidate qualifications
  • You are hiring a direct employee and have time to manage the entire recruiting effort 
  • You have a process for receiving, screening, and tracking all resumes and applications
  • You are prepared to respond to all applicants

We recommend CareerBuilder for VoIP engineer openings:


CareerBuilder has been a trusted source for hiring since 1995. Reach 80+ million unique, diverse U.S. job seekers annually by posting your jobs through their talent acquisition channels. Through CareerBuilder, you can engage candidates and drive them into your sourcing pipeline. We recommend using CareerBuilder for hiring when you have the internal resources and processes to review, screen, and reply to all applicants.

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3. Leverage your internal resources

You can utilize your own website, social media, and employees to assist in your search for top candidates. 

A company website posting should be the first step in notifying prospective candidates that you are hiring. Social media can also be a powerful tool for spreading the word about your new opening. As far as exposure is concerned, this option can be as good as some job boards when you have a large enough following across various platforms, like LinkedIn, Instagram, Facebook, TikTok, and Twitter.

Current employees are every organization’s greatest asset. Encourage your internal team to promote job openings to their network by offering cash and other incentives.

We recommend these options when:

  • Your brand has great name recognition
  • You can consistently monitor and respond to candidate activity through your website and social media accounts
  • You have a process in place to quickly and broadly communicate job openings and requirements
  • You have an effective employee referral program in place

If you aren’t sure which path is best, schedule a discovery call today with our seasoned recruiting professionals. The 4 Corner team is on standby to help you find the best option for your unique hiring need.

Sample Interview Questions

  • Describe your technical background and education?
  • Which VoIP voice systems have you supported in the past?
  • Describe your experience deploying VoIP systems?
  • Which certifications do you currently have?
  • Describe your toughest troubleshooting challenge and how you solved it.
  • What is your greatest technical achievement to date? Why was it significant?
  • Some of our clients are concerned about how to implement VoIP technology without interrupting business as usual. What would you advise them?
  • How do you keep your knowledge up-to-date?
  • How do you deal with stress or pressure at work?
  • How well did your education prepare you for your career? For example, did it provide you with the skills necessary to succeed in this field?
  • How do you handle criticism or discipline at work?
  • Describe a time when you missed an obvious solution to a problem. What did you do?

Need help hiring a VoIP Engineer?

We match top professionals with great employers across the country. From filling urgent job openings to developing long-term hiring strategies, our team is here to help. Review our staffing solutions, browse our award-winning Staffing Corner blog, or call today. We look forward to connecting with you soon.

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