[SR-Users] Problem with Freeswitch with IP public and Kamailio behind NAT

[Hai Bui Duc Ha]

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 at 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 at 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 at 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
-- 
Hai Bui
VoIP engineer, Cvoice team, HTK-HCM Office
Mobile: +84-165-618-9876
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