I am using kamailio as sip server and asterisk as media server behind pf-sense

firewall (NAT) with a public ip.

Sip signalling as well as rtp packets are flowing correctly when the endpoints are within

a network. But when trying from outside network sip signalling is working perfectly

but there is no RTP.

Public ip behind pfsense -> 182.70.xx.yy

kamailio+rtpengine and asterisk servers are on private ips --> 192.168.1.x 

kamailio ip - 192.168.1.x

asterisk ip - 192.168.1.y

Please, feel free to ask for more information.

Thanks & Regards,

Arish Haque