Hi Fred,
I have advertised the udp port in kamailio.cfg like below -
listen=udp:192.168.1.x:5060 advertise 182.70.xx.yy:5060
But how to advertise rtp Ports??
I have attached sip.conf
Asterisk 1----\    
               \ ------ Kamailio+RTPPROXY ---- FW (pfsense 182.75.xx.yy  public-IP)--- INTERNET
                \      (private ip - 192.168.1.x)
Asterisk n------\                


Thanks & Regards,
Arish Haque