Are the clients behind NAT? If yes, you have to use proper NAT traversal on the LB. Further, for outgoing INVITEs you have to route the requests through the LB, either by static forwarding to the LB or using the Path extension.

regards Klaus

On 21.02.2013 12:36, chanea wrote:

Dear All,

I am trying to use Kamailio 3.1.x server (called LB here) as the Load Balancer for two other Kamailio server (called server01 and server02 here) .

Client A -----> Kamailio LB -----> Kamailio server01 Client B -----> Kamailio LB -----> Kamailio server01

If I dont use LB here , and letting Client A and B connect to Kamailio server01 directly , all the communication is fine.

While using Kamailio LB ,without luck, although the sip client A and B get 200 from server01 for Register, they cannot reach each other for "Message" and "Invite".

It will be great appreciated if anyone can give a hint.

my config for Kamailio LB is as below :

.... debug=2 # debug level (cmd line: -dddddddddd) fork=yes log_stderror=yes # (cmd line: -E)

children=2 check_via=no # (cmd. line: -v) dns=off # (cmd. line: -r) rev_dns=off # (cmd. line: -R) port=5060

# for more info: sip_router -h

# ------------------ module loading ---------------------------------- mpath="/usr/local/lib64/kamailio/modules_k/:/usr/local/lib64/kamailio/modules/"

loadmodule "sl.so" loadmodule "tm.so" loadmodule "rr.so" loadmodule "maxfwd.so" loadmodule "usrloc.so" loadmodule "registrar.so" loadmodule "textops.so" loadmodule "mi_fifo.so" loadmodule "dispatcher.so" loadmodule "db_mysql.so"

# ----------------- setting module-specific parameters --------------- # -- dispatcher params -- modparam("mi_fifo", "fifo_name", "/tmp/openser_fifo") modparam("dispatcher", "db_url","mysql://.........@........") modparam("usrloc", "db_mode", 0) modparam("rr", "enable_full_lr", 1)

route{ if (!mf_process_maxfwd_header("10")) { sl_send_reply("483","Too Many Hops"); exit; };

    #  if (!method=="REGISTER")
    #        record_route();

ds_select_dst("1","4"); forward();

  exit;

} .. ==========================================

best regards,

chanea

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