i've been trying to setup my communication setup , everything works fine when i use my kamailio setup within the local network but as soon as i assign a public IP to kamailio , there is no  RTP flow between the clients 

i searched over internet and found that rtpengine module should be used when using the stup on public network ,and tried configureation(with some tweaks) given by https://github.com/caruizdiaz/kamailio-ws 

i also observed that the call still flows when the two clients are in same network.

please help what should i do!

thanx in advance! :)