c++ telecom billing

I am having more than 9.5 years exp in IT industry. Initial 4 years I worked in Search engine domain and later shifted to telecom billing. Currently I am working with “Convergys India” a leading telecom billing company. On behalf of Convergys I am working for AT&T and T mobile (Big telecom operators in USA) I am looking for H1B visa processing. As part of search engine and telecom prepaid billing system I was involved in multi threading programming with STL and TCP/IP sockets, in CPP, Pro *c, Perl scripting