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Senior Technical Support (Core Voice)

Date: 15-Jan-2021

Location: GB

Company: Telefónica S.A.

Location: Slough


We are O2, the commercial brand of Telefonica UK Limited, a leading digital communications company owned by Telefonica S.A. We put our 25 million UK customers at the heart of everything we do, so we can use our technology to connect them to the experiences they live for.


And just like our customers, we open up exciting possibilities for our employees too. Great benefits. Generous rewards. High-quality training. Ongoing career development. These are just some of the reasons to join us.


We’re always on the lookout for great talent, and we’re all about inclusivity. We want to be a true reflection of our customers and their communities, to help us make the best decisions. That’s why everybody’s welcome at O2 – it’s time to get everyone in the room.


What do the team do?


The role is within the Core Voice Operations area of the Telefónica O2 UK operations team, providing a second to none support function for a wide variety of live Telefónica O2 UK customer facing services.  It is a fast-moving environment with a constant rate of change and new deliveries, requiring individuals to be focused but flexible in their approach.


How will you fit into this?


The core support engineer role is an essential position within the team and provides an essential part of the customer support, fault investigation and end-to-end project delivery function providing test and operational and excellent levels of co-ordination and guardianship of the network. This demands a pro-active approach looking for improvements from design, test, support, reporting, monitoring and delivering these.


Some of the more specific responsibilities:


  • Find solutions to complex technical faults within E/// core network
  • To provide testing support for E/// core network solutions when required
  • To investigate faults and to provide technical expertise when requested
  • To provide 24x7 on-call and hands-on support, as part of a rota
  • To provide project out of hours support for FOAs and rollouts
  • To provide testing services to project and issues for core voice network nodes
  • Actively manage LIVE and test issues working closely with the vendor(s)
  • Actively lead the co-ordination and updates of ongoing service optimisation activities
  • Actively look for improvements to reporting, alarming, monitoring, training & education
  • Provide engagement to project teams for impact assessment, design review, planning of logical phases and required delivery process
  • Provide technical advice to change planning and implementations


What we need from you:


  • Experience with Ericsson MBC, HLR, HSS, HSSFE, SBG, IPWorks, SES, BGF, AAA, PCRF, CSCF, MGW and virtualised solutions vMSS, vIMS nodes, vMGW, vHSS.
  • Experience with Ericsson UDC
  • Experience with Empirix EXMS, IntelliSight, PRM tools
  • Experience with Linux/UNIX, Network IP, SS7, IMS/SIP, SigTran
  • Experience with proOptima


Additional Information:


Grade:  PTG

Salary and benefits:

We’re looking to pay a competitive salary (depending on experience) for this position. We also offer plenty of extras to sweeten the deal, which could include things like bonuses, life assurance cover, health care, holiday entitlement and lots of flexible benefits. We also believe a great work-life balance is important, so we’re open to considering part time and flexible approaches to working. Like to know more? Feel free to raise it.

If you have any questions about the role then please email who will be happy to help.