I have over 10 year of development, configuration and implementation of ip-telephony solutions based on asterisk and OpenSIPS. Integration of ip-telephony into business processes of companies. Setting up and administering Linux. Setting up telecommunication equipment (voip-gateways, ip-phones, ip-ATS). Technologies, protocols: asterisk (1.4-13), OpenSIPS, SIP, H323, DSS-1, SS7, ISDN Operating Systems: Linux CentOS, Debian. Development languages: PHP, Perl, Schell, JavaSctipt, SQL, HTML Database Servers: MySql