Hi, i am a telecom engineer expertise in freeswitch,asterisk,kamailio,opensips. i also develop th e custom module in c in all these switches.i am also working on esl,agi,ami,cfg for freeswitch,asterisk,kamailio respectively. i developed the class4/5 switch,call center solution and pbx. i configured the fusion pbx,astpp and customize too. i am also expetise in core java,php,lua.