Hi all,

I work on Kazoo system. I have NAT problem when configure Freeswitch and Kamailio.

As the old network diagram:

https://lh3.googleusercontent.com/-dVJit4UPAL8/VuI4z1LBdKI/AAAAAAAABDo/zSG0IUFI4noUZXHQ9tDhQB5ZmYm_0glfw/s1600/Screen%2BShot%2B2016-03-11%2Bat%2B10.17.17%2BAM.png I configure dispatcher to FS 1,2 with IP private and map IP public <-> IP private for each server via Router. This work fine. Then now, I want to improve FS performance so that I set up new FS with IP public:

https://lh3.googleusercontent.com/-YZl8d3HBo8E/VuI7ChgTGzI/AAAAAAAABD0/AQQW6N1SbjwOInoRyttWKGeXeFvo0HMPQ/s1600/Screen%2BShot%2B2016-03-11%2Bat%2B10.26.53%2BAM.png I configure dispatcher FS3 with IP public, connection between FS3 & ecallmgr via public IP is Okay but have problem with NAT: *When Kamailio foward SIP INVITE message to FS3 then FS3 response 200 OK message but it send to Ip private of Kamailio not IP public.* As Kamailio I have already configure advertise IP public: local.cfg listen=UDP_SIP advertise 125.212.212.40:5060 listen=TCP_SIP advertise 125.212.212.40:5060

View console log on Freeswitch, I see the ecallmgr response to FS3:

1. bridge({outbound_redirect_fatal="false",call_timeout=20, originate_timeout=20,local_var_clobber="true"}[ecallmgr_Authorizing-ID= "71310939684a2c8acc4e0e6dff1be6c2",ecallmgr_Owner-ID= "188cd101dcea060d080261b328fdf1ca",ecallmgr_Account-ID= "3f221d1ce6959ec04acd372923e253b9",sdp_secure_savp_only="false", sip_invite_domain="hahai1412.anttel-pro.ab-kz-02.antbuddy.com", presence_id="sharklasers@hahai1412.anttel-pro.ab-kz-02.antbuddy.com https://happy.antbuddy.com/sharklasers@hahai1412.anttel-pro.ab-kz-02.antbuddy.com ",sip_h_X-KAZOO-AOR=sip:sharklasers@hahai1412.anttel-pro.ab-kz- 02.antbuddy.com,absolute_codec_string="^^:PCMU:VP8",leg_timeout="20", effective_callee_id_number="sharklasers",effective_callee_id_name= "sharklasers ",origination_callee_id_number="sharklasers", origination_callee_id_name="sharklasers ",ecallmgr_Realm=" hahai1412.anttel-pro.ab-kz-02.antbuddy.com",ecallmgr_Username= "sharklasers"]sofia/sipinterface_1/sharklasers@113.161.89.159:5914 https://happy.antbuddy.com/sharklasers@113.161.89.159:5914;transport=ws ;*fs_path=sip:10.127.15.36:5060*;lr;received="sip:113.161.89.159:5914 ;transport=ws")

I research fs_path parameter: https://wiki.freeswitch.org/wiki/Sofia-SIP#Specifying_SIP_Proxy_With_fs_path I guess this is broken It should be Public IP: *fs_path=sip:125.212.212.40:5060*. But I don't know how I can change this parameter ! Anybody faced that problem ? Any solution ?

Regards, Hai Bui