Telecom/MVNO support and integration expert

- GSM,UMTS,LTE networks. Mobile calls, SMS, data sessions - resolving problems up to source code level, cooperating with R&D, working with documentation, \r\nGSM 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\r\n- 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\r\n- IP networks, TCPIP. Switching, routing, VLAN tagging, VRRP. Tracing with Wireshark, tcpdump\r\n- Linux (CentOS), Solaris. Resolving problems, monitoring CPU and memory, clusters\r\n- Voice over IP, SIP, H.248/MEGACO, RTP\r\n- Virtualization – VMWare\r\n- Scripting using shell, Perl, Python, Javascript, HTML. Automation including access to databases and using SOAP calls\r\n- databases (PostgreSQL). Complex SQL queries, writing custom reports. Database performance tuning, backups and recovery, replication set up\r\n- source code reading - C++, Java\r\n- support and deployment of Java applications, tuning performance\r\n- Apache webservers, load balancing - based on Apache, F5 networks\r\n- network monitoring - Nagios\r\n