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VPBX/SIP Engineer

  • Salary: Negotiable
  • Job type: Permanent
  • Location: Hatfield, Hertfordshire
  • Sector: IT
  • Date posted: 05/10/2018
  • Job reference: BBBH89762


  • To maintan, test and monitor my client's core virtual PBX and IMS + ancillary systems
  • To integrate, deploy and upgrade core telephony and unified communications technologies and platforms
  • To manage, operate and take accountability for current and future SIP provisioning process.
  • To manage, operate and take accountability for continued VoIP operations and maintenance including as needed applying patches, updates, to ensure critical bugs or security ossues addressed in a timely manner.
  • Maintenance of mixed vendor test lab environment
  • Tier 3 support for Virtual PBX for Tier 1 & 2 teams
  • Tier 3 support for Call recording platform for Tier 1 & 2 teams
  • Key Performance Metrics collection and reporting
  • Support for deployment of variety of hardware and software based Session Intiation (SIP) Clients SIP clients
  • To curratre, and continuously improve technical documentation in the form of guides, playbooks and reports.
  • Normal business hours and after hours/on call responsibilities as required for overnight upgrades, eligible for on-call rota
  • To multi-task between projects and provide customer facing support for all provided converged communication services
  • To troubleshoot SIP call processing
  • To support escalated tickets
  • Responsible for owning escalations from different areas in relation to complex SIP calls flows
  • To understand each customers business needs and how they relate to the technologies being supported

Personal Qualities and Experience

  • Demonstrate expertise in deployment, maintenance, and troubleshooting and testing of VoIP and VPBX technologies.
  • Good understanding of the Internet Engineering Task Froce (IETF) Request for Comment (RFC) stanfards and be able to interpret different intrepratation of standards
  • Call Control/Call Signalling Experience, including fundamental knowledge of IMS & VoLTE
  • Deep level of knowledge in computer networking (e.g. TCP/IP, IPv4, IPv6, DNS, DHCP)
  • Expert knowledge in SIP messaging including reading traces or problem isolation
  • Good level of scripting principles, well versed in database administration, experience working with Python or similar scripting languages
  • Demonstrates sound judgement in solving problems, identifying problems in advance, and proposing solutions.
  • Strong analytical and organisational skills, with attention to detail.
  • Demonstrate strong verbal and written communication skills.
  • Ability to multi-task, prioritising multiple objectives and initiatives.
  • Comfortable working on a Linux environment / worked in a Linux server environment and understands basic commands
  • Excellent communication skills both oral and written.
  • Able to work independently and as part of a team.
  • Experience managing network upgrade projects
  • Experience with VoIP as a Service
  • Experience in vitalised data centres
  • Cisco certifications (CCIE, CCNA, CCNP, CCDA, CCDP) a plus
  • Experience with one of the following vendors (Cisco, Fortinet, Broadsoft, Huawei, Juniper)

Behavioural Competencies Passionate:

  • Builds commitment by winning the hearts and minds of others. Is respected by colleagues and identified as a role model.
  • Puts aside personal agendas to work for the benefit of the organisation, customers, and suppliers. Proactively builds knowledge capability through the sharing of knowledge, best practice, and expertise with others.
  • Clearly communicates ideas, plans and strategies, taking ownership and accountability to deliver what we say.
  • Willing and able to go the extra mile.


  • Generates innovative approaches with potentially significant long-term impact, introducing improvements to the way things are done.
  • Pioneering/entrepreneurial thinker.
  • Able to get the best from technology.


  • Demonstrates complete focus and determination to achieve/exceed KPI's. Is a self-starter and takes the initiative in situations.
  • Learns quickly, adapting thought and action to changing business and customer demands. Can engage and enthuse others through the process of change.
  • Is dedicated to meeting/exceeding the expectations and requirements of internal and external customers. Uses information to improve services and solutions. Manages the customer experience to ensure positive relationships and retention.
  • Welcomes continuous professional development to learn and grow.
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