Hi First of all attention that my knowledge in English language is very low and I can not speak very well . sorry for this . I am in trouble with integrating freeswitch with kamailio . actually I want to set kamailio as sip server and freeswitch as media server . This will be better if both of them config behind a linux nat . for example I have a public IP address and a local zone with two virtual machine . My physical host IP is Public 1.1.1.1 Internal 192.168.1.1 And my FS and kamailio in local zone are FS 192.168.1.2 Kamailio. 192.168.1.3 I don't know what exactly must I do in config files. Please help me . I can config kamailio and free switch alonly but I want to integrate both of them to high performance . Thanks dude for your attention .