thanks for an answer & sorry for the delay (Christmas time).

Here we go:

Scenario: phone1(192.168.9.3, 192.168.10.75 (nat)) <--TCP--> kamailio1(192.168.10.2) <--UDP--> kamailio2(192.168.5.3) <--UDP--> phone2(192.168.12.2)

dialog::  hash=1456:1090244220
    state:: 4
    timestart:: 1388767148
    timeout:: 111170022
    callid:: 7fbca98b-22ea049@192.168.9.3
    from_uri:: sip:phone1@example.com
    from_tag:: 17cfe8a323b2ac11o1
    caller_contact:: sip:phone1@192.168.10.75:5075;transport=tcp
    caller_cseq:: 102
    caller_route_set::
    caller_bind_addr:: tcp:192.168.10.2:5060
    to_uri:: sip:phone2@example.com
    to_tag:: a94c095b773be1dd6e8d668a785a9c84ec059e7d
    callee_contact:: sip:phone2@192.168.12.2:5060
    callee_cseq:: 102
    callee_route_set:: <sip:192.168.10.2;r2=on;lr=on;ftag=17cfe8a323b2ac11o1;vsf=AAAAAAAGAQIIAAIDAgh5UEBXIR0VSRIfZS5zaw--;nat=yes;did=0b5.c7ecbf04>,<sip:192.168.5.3;lr=on;did=0b5.0b>
    callee_bind_addr:: udp:192.168.10.2:5060