Voice Core Engineer
Voice Core Engineer
Posted on :
31-07-2025
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1 Vacancy
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Job Description
Job Title: Voice Core Engineer
Location: Lisbon Portugal
Work Regime: Full-time & Hybrid (2x office per week)
Overview / Summary:
We are looking for a Voice Core Engineer to join our team in a telecommunications project!
Responsibilities and Tasks:
- Operate configure and maintain IMS/CS voice core network nodes;
- Analyze and troubleshoot VoLTE/IMS call flows and procedures;
- Manage subscriber profiles and parameters in HSS/HLR understanding their impact on service behavior;
- Work with VoLTE-related protocols for call and service troubleshooting;
- Ensure correct integration and operation of VoLTE/VoWifi solutions based on architecture and functional design;
- Support signaling elements (DRA STP) databases (HSS HLR CuDB) and features like ENUM and Number Portability.
Requirements
Mandatory Requirements:
- Voice Core network (IMS/CS) 3-year experienced engineer;
- Experience working with IMS Voice/VoLTE core nodes such as SBC x-CSCF TAS (MMTel-AS SCC-AS IP-SM-GW IM-SSF) BGCF MGCF and MRF;
- Experience working with CS Voice/VoLTE core nodes such as: MGW MSC MGCF IM-MGW;
- Experience analyzing IMS voice-related flows and procedures (e.g. VoLTE-VoLTE call T-ADS Homing Break-in call Break-out call);
- Knowledge of the parameters that compose the subscriber s profile in HSS/HLR and their impacts on the network behavior;
- Comfortable with VoLTE-related protocols (e.g. SIP Diameter DNS H248 Camel RTP/RTCP);
- Comfortable with VoLTE/VoWifi concepts and architecture;
- Preferable: experience with HSS HLR and CuDB;
- Preferable: experience with signaling transfer elements (e.g. DRA STP)
- Preferable: experience with DNS/ENUM and Number Portability (NP);
- Vendors: Huawei / Oracle / Ericsson/ Mavenir/ Nokia;
- Excellent verbal and written communication skills (Portuguese and English).
Complementary Requirements:
- Electronics/Telecommunications/Computer Engineering BSc or MSc degree;
- Certifications from Ericsson Huawei Nokia or Cisco are a plus;
- Customer facing experience in Telecom operators;
- Ability to plan organize and prioritize the responsibilities;
- Good team player and with highly proactive skills.
#VisionaryFuture - Build the future join our living ecosystem!
Mandatory Requirements: Voice Core network (IMS/CS) 3-year experienced engineer; Experience working with IMS Voice/VoLTE core nodes such as SBC, x-CSCF, TAS (MMTel-AS, SCC-AS, IP-SM-GW, IM-SSF), BGCF, MGCF, and MRF; Experience working with CS Voice/VoLTE core nodes such as: MGW, MSC, MGCF, IM-MGW; Experience analyzing IMS voice-related flows and procedures (e.g., VoLTE-VoLTE call, T-ADS, Homing, Break-in call, Break-out call); Knowledge of the parameters that compose the subscriber s profile in HSS/HLR and their impacts on the network behavior; Comfortable with VoLTE-related protocols (e.g., SIP, Diameter, DNS, H248, Camel, RTP/RTCP); Comfortable with VoLTE/VoWifi concepts and architecture; Preferable: experience with HSS, HLR and CuDB; Preferable: experience with signaling transfer elements (e.g., DRA, STP) Preferable: experience with DNS/ENUM and Number Portability (NP); Vendors: Huawei / Oracle / Ericsson/ Mavenir/ Nokia; Excellent verbal and written communication skills (Portuguese and English). Complementary Requirements: Electronics/Telecommunications/Computer Engineering BSc or MSc degree; Certifications from Ericsson, Huawei, Nokia, or Cisco are a plus; Customer facing experience in Telecom operators; Ability to plan, organize and prioritize the responsibilities; Good team player and with highly proactive skills.
Employment Type
Full Time
Key Skills
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