[Serusers] Nathelper cfg ?

My script has following information regarding NAT, I have installed RTPProxy and I cannot hear any communication between the phones. Here is my configuration, # global parameters mhomed=yes # Nathelper loadmodule "/usr/local/lib/ser/modules/nathelper.so" # Parameter section modparam("nathelper","natping_interval", 10) # Routing section route { ..... if( method=="INVITE") { record_route(); force_rtp_proxy(); /* set up reply processing */ t_on_reply("1"); }; .... } #route leg # all incoming replied for t_onreplied transactions enter here onreply_route[1] { if( status =~"[12][0-9][0-9]" ){ force_rtp_proxy(); }; } Can anyone please help me what should I need to do further to call between my Cisco ATA 186 and X-lite. Best Regards, Kannaiyan