- Strong understanding of IMS architecture and call flows, including P/I/S-CSCF, BGCF, MGCF, SBC, TAS/MMTel, HSS/UDM, PCRF/PCF, AS and related network functions.
- Knowledge of VoLTE, VoWiFi and VoBB fundamentals, including registration, originating and terminating calls, supplementary services, SMS over IMS, emergency calls, interconnect and roaming scenarios.
- Familiarity with vendor-specific IMS implementations and common deployment topologies.

Protocols and networking:

- SIP and SDP expertise, including method types, dialogs, routing, forking, error codes, re-INVITE and UPDATE.
- Diameter knowledge across Cx, Sh, Ro, Rx, Gy/Gx interfaces, with exposure to Radius where applicable.
- Solid IP networking capability, including IPv4/IPv6, routing, VLANs, DNS/ENUM, NAT, firewalls, load balancers and QoS.
- Understanding of TLS/IPSec, certificates and basic security concepts for signaling and media.

Platforms, OS and tooling:

- Linux administration skills, including systemd, networking, storage and performance basics.
- Experience with virtualization and cloud/NFVI concepts, including VMs, OpenStack, VMware and increasingly containers/Kubernetes for cloud-native IMS.
- Proficiency with tracing and analysis tools such as tcpdump, Wireshark, vendor trace tools, log parsing, KPI/alarm monitoring, NMS/EMS,



Grafana, Prometheus or equivalent platforms.
- Scripting and automation capability using bash, Python, Ansible or similar tools for log extraction, health checks and repetitive operational tasks.

Support / operations skills:

- End-to-end troubleshooting mindset, with the ability to correlate alarms, logs, traces and KPIs to isolate root cause.
- Understanding of maintenance activities, including upgrades, patches, parameter changes, capacity expansions and rollback strategies.
- Familiarity with incident, problem and change management practices, including RFO/RCA creation.
- Strong SLA awareness, including prioritization, escalation handling and impact analysis.

Customer and teamwork skills:

- Clear written and verbal communication skills with operators and customers, with the ability to explain complex issues simply.
- Structured documentation habits, including case notes, known-error records and runbooks.
- Solid collaboration with integration, design and R&D;/PD teams, with the ability to challenge and refine solutions based on field reality.
- Readiness for on-call and high-pressure outage handling while remaining calm, structured and methodical.

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📌 Customer Network Support Engineer (Ryde)
🏢 Ericsson
📍 Ryde