- GSM,UMTS,LTE networks. Mobile calls, SMS, data sessions - resolving problems up to source code level, cooperating with R&D, working with documentation,
GSM and 3GPP specifications. Performing technical support for NGN networks: softswitches, call servers, media gateways. Making software updates, performing hardware maintenance, such as: servers, blades, data centres
- SS7, Sigtran. All levels, up to application. Tracing calls via Geoprobe, Wireshark. Working with specs. Signalling gateways - Cisco ITP, Genband. SCCP routing, SS7 to sigtran converters. SS7 stacks: Trillium, Ulticom
- IP networks, TCPIP. Switching, routing, VLAN tagging, VRRP. Tracing with Wireshark, tcpdump
- Linux (CentOS), Solaris. Resolving problems, monitoring CPU and memory, clusters
- Voice over IP, SIP, H.248/MEGACO, RTP
- Virtualization – VMWare
- Scripting using shell, Perl, Python, Javascript, HTML. Automation including access to databases and using SOAP calls
- databases (PostgreSQL). Complex SQL queries, writing custom reports. Database performance tuning, backups and recovery, replication set up
- source code reading - C++, Java
- support and deployment of Java applications, tuning performance
- Apache webservers, load balancing - based on Apache, F5 networks
- network monitoring - Nagios
MVNO technical support and integration expert
Mobile core engineer
