Core Network Support Engineer - Voice Core (f/m/x)Ready to ensure stable and high-quality voice services and act as a key technical interface between operators and vendor teams? Then we would love to hear from you!Salary: € 3000-5000 gross 14x per year + monthly amount for on-call dutyLocation: Vienna, 21st district, (no remote work opportunity)Technologies: ISUP | MAP | SIP | Diameter | GTP | Linux | Openstack | Container | IMS | 2-5GSector: TelecommunicationWorking hours: Flexible work time with possible on-call dutyTeam Size: 14 membersWhat will I do here?Vendor Interface & Technical Support: Act as the technical representative for telecom operators and coordinate with internal Level 3 / R&D teams for issue resolution.Voice Core Operations & Maintenance: Operate and maintain IMS and voice core elements (e.g., CSCF, HSS/UDM, SBC, MGW, TAS) including VoLTE/VoNR services in virtualized environments.Incident Management & Troubleshooting: Investigate and resolve voice service issues (e.g., SIP signaling, call setup failures, interconnect issues) to ensure high service availability.Signaling & Interconnect Analysis: Analyze SIP and legacy signaling (SS7/MAP/ISUP) and support roaming as well as inter-operator voice connectivity.Change Management & Service Quality: Perform system upgrades and configuration changes while monitoring KPIs and improving overall voice service performance.What should I bring with me?Education & Experience: Degree in Telecommunications, IT, or a related field, or relevant hands-on experience in telecom network environments.Voice Core Expertise: Solid experience with IMS / Voice Core technologies (e.g., VoLTE, SIP, SBC, CSCF, MGW, HSS).Signaling & Protocol Knowledge: Good understanding of SIP and ideally legacy signaling protocols such as SS7, MAP, or ISUP.Troubleshooting & Systems: Experience in analyzing voice service issues, working in incident-driven environments, and basic knowledge of Linux systems.Communication & Ownership: Strong communication skills in customer-facing and international environments, combined with a proactive mindset and high sense of responsibility.About the CompanyThe company is a leading international telecommunications vendor, providing innovative solutions for voice and core network services. Join the international Core Network team (10 members) and take on a vendor-facing role, supporting major mobile network operators in Austria in the operation, troubleshooting, and continuous improvement of their Voice Core and IMS environments.Salary€ 3.000 to € 5.000 (paid 14 x p.a.), depending on qualifications and experience.📩 Aplication Process:Initial interview with STEINER-HITECH via video callVideo Call with the Core Network TeamWe’ll guide you through the entire process!👨 Your Contact Person:Sascha Muffoffice@steiner-hitech.at+43 1 876 77 88Talpagasse 1A, 1230 Wienwww.steiner-hitech.at

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Core Network Engineer - Voice Core