Daniel Thanks a lot for your response, in my case i don't want to provide so many ips to carriers acl because aws elastic ip are not consistent, that is the reason i wanted to proxy everything trough kamailio, here it is my setup 

i wont be doing any registration because of my setup does not required it, on hardware i had kamailio forwarding to freeswitch then distributed to asterisk and finish to a sbcswitch which i will be virtualizing on aws.

again thanks a lot for your advice you're the best.

originador >>>kamailioA >>>>asterisk >> KamilioB>>> Termination

debug=4 

log_stderror=yes 

#!else 

debug=2 

log_stderror=yes 

#!endif 

memdbg=5 

memlog=5 

log_facility=LOG_LOCAL0 

fork=yes 

children=4 

auto_aliases=no 

listen=udp:internal ip:5060 advertise external ip:5060 

mhomed=0 

alias="mysip.com" 

alias="Internal IP:5060" 

alias=Internal IP:5060 

alias=Elastic IP 

alias=Elastic IP:5060 

port=5060 

enable_tls=no 

#tcp_connection_lifetime=3605 

#!ifdef WITH_SRCPATH 

mpath="modules_k:modules" 

#!else 

mpath="/usr/lib64/kamailio/modules_k/:/usr/lib64/kamailio/modules/" 

mpath="/usr/lib64/kamailio/modules_k/:/usr/lib64/kamailio/modules/" 

#!endif 

loadmodule "tm.so" 

loadmodule "sl.so" 

loadmodule "rr.so" 

loadmodule "maxfwd.so" 

loadmodule "textops.so" 

loadmodule "pv.so" 

loadmodule "dispatcher.so" 

loadmodule "usrloc.so" 

loadmodule "registrar.so" 

loadmodule "siputils.so" 

loadmodule "sanity.so" 

loadmodule "ctl.so" 

loadmodule "mi_rpc.so" 

loadmodule "acc.so" 

loadmodule "avpops.so" 

#!ifdef WITH_NAT 

loadmodule "nathelper.so" 

loadmodule "rtpproxy.so" 

#!endif 

loadmodule "xlog.so" 

modparam("tm", "failure_reply_mode", 3) 

modparam("tm", "fr_timer", 30000) 

modparam("tm", "fr_inv_timer", 120000) 

modparam("dispatcher", "list_file", "/etc/kamailio/dispatcher.lst") 

#!ifdef WITH_NAT 

# ----- rtpproxy params ----- 

modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:7722") 

# ----- nathelper params ----- 

modparam("nathelper", "natping_interval", 30) 

modparam("nathelper", "ping_nated_only", 1) 

modparam("nathelper", "sipping_bflag", FLB_NATSIPPING) 

modparam("nathelper", "sipping_from", "sip:pinger@kamailio.org") 

# params needed for NAT traversal in other modules 

modparam("nathelper|registrar", "received_avp", "$avp(RECEIVED)") 

modparam("usrloc", "nat_bflag", FLB_NATB) 

#!endif 

         #subst_uri('/^sip:1([23456789][0-9]+)@(.*)$/sip:\1@\2/i'); 

request_route { 

#checking for loops

        if (!mf_process_maxfwd_header("10")) { 

                sl_send_reply("483","Too Many Hops"); 

                exit; 

        } 

        if (loose_route()) { 

                if (!t_relay()) { 

                        sl_reply_error(); 

                } 

                exit; 

        } 

        if (is_method("INVITE")) { 

                record_route(); 

                append_hf("X-Src-IP: $src_ip\r\n"); 

        } 

#i a planning to send it to distpatcher module once i get calls flowing.

        if(!t_relay_to_udp("ip internal", "5060")) { 

                sl_reply_error(); 

        } 

        exit; 

} 

On Tue, Mar 26, 2013 at 5:13 AM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:

Hello,

On 3/26/13 2:38 AM, Felipe Ramos wrote:

Can anyone please point me on a configuration example for kamailio when it is behind NAT, i need to change the contact ip from internal to external on sdp

you should not need that. Kamailio should do record routing, advertising the public IP, so the signaling from the other side is sent to Route headers, not to Contact address.

Use:

listen=udp:_internal_ip_:5060 advertise _external_ip_:5060

and proxy all media from outside to internal asterisk farm.

Asterisk has support for external IP, so it can advertise that IP in SDP and the media will go directly to the asterisk. Makes no sense to make a user space forwarding with rtpproxy.

Cheers,
Daniel

Please any help will be appreciated.

most of documentation available is when client is behind Nat but not when Server behind Nat like is the case with Amazon aws vpc instances.

Again thank you before hand.

_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users@lists.sip-router.org
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-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, April 16-17, 2013, Berlin
 - http://conference.kamailio.com -

_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users@lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, April 16-17, 2013, Berlin
 - http://conference.kamailio.com -