IMS & VoLTE Network Support Engineer

Ericsson AB; Ryde; On-site; AUD 90,000 - 150,000; Full time

Job summary

Ericsson AB in NSW is seeking an experienced IMS/VoIP Engineer to optimize core signaling, reliability and performance. You will tackle VoLTE/VoWiFi issues, SIP/SDP handling and security across vendor IMS implementations, with a focus on scalable network functions.

Expect hands-on troubleshooting, collaboration with R&D and field teams, and strict adherence to change control, documentation, and incident response practices in a high-availability telecom environment.

Qualifications

• IMS core/networking engineering experience with VoLTE/VoWiFi/VoBB.
• Deep SIP/SDP, Diameter across core interfaces and security.
• Linux admin skills, virtualization, cloud/NFVI and containerization.
• Proficient tracing: tcpdump/Wireshark; scripting for automation.
• Strong incident, change and SLA management, and runbook creation.

Skills

IMS architecture

Call flows

P/I/S-CSCF

BGCF/MGCF

SBC

TAS/MMTel

HSS/UDM

PCRF/PCF

AS and network functions

VoLTE

VoWiFi

VoBB

SIP

SDP

Diameter (Cx/Sh/Ro/Rx)

TLS/IPSec security

IPv4/IPv6

VLANs

DNS/ENUM

NAT/Firewalls

QoS

Linux basics

OpenStack/VMware

Kubernetes

tcpdump/Wireshark

Scripting (bash, Python)

Ansible

Troubleshooting

Incident/Change management

SLA awareness

Documentation

Tools

tcpdump

Wireshark

Grafana

Prometheus

Job description

Ericsson AB in NSW is seeking an experienced IMS/VoIP Engineer to optimize core signaling, reliability and performance. You will tackle VoLTE/VoWiFi issues, SIP/SDP handling and security across vendor IMS implementations, with a focus on scalable network functions.

Expect hands-on troubleshooting, collaboration with R&D and field teams, and strict adherence to change control, documentation, and incident response practices in a high-availability telecom environment.