Finally, I figured what is going on. The client is the culprit. I am using pjsip library which by default is configured to rewrite the Contact Header when it detects a change in IP address in response. It is basically Unregistering the Private address contact and Registering the public IP contact. This is erasing the Cflags recorded before.

Krish Kura

On Sat, Oct 1, 2011 at 6:21 PM, Krishna Kurapati kkurapat@gmail.com wrote:

Hi,

I am hitting bit of a wall here.

• I am setting bflags for NAT, and SIPPING before save("location")

however, when I do "kamctl ul show", the Cflag is 0.

I also checked see if the bflags are set or not in the register routine - they are being set.

What am I missing?

snippets of the config files.

#!define FLB_NATB 6 #!define FLB_NATSIPPING 7 modparam("nathelper", "natping_interval", 30) modparam("nathelper", "ping_nated_only", 1) modparam("nathelper", "sipping_bflag", FLB_NATSIPPING) modparam("nathelper", "sipping_method", "INFO") modparam("nathelper", "sipping_from", "sip:pinger@50.62.1.7")

# params needed for NAT traversal in other modules modparam("nathelper|registrar|usrloc", "received_avp", "$avp(RECEIVED)") modparam("usrloc", "nat_bflag", FLB_NATB)

# Caller NAT detection route route[NAT] { #!ifdef WITH_NAT force_rport(); if (nat_uac_test("19")) { if (method=="REGISTER") { fix_nated_register(); } else { fix_nated_contact(); } setflag(FLT_NATS); setbflag(FLB_NATB); } #!endif return; }

# Handle SIP registrations route[REGISTRAR] { if (is_method("REGISTER")) { xlog("L_ALERT", "REGISTER: From $fU, $fd To $tU, $td"); if (isflagset(FLT_NATS) || isbflagset(FLB_NATB)) { setbflag(FLB_NATB); # uncomment next line to do SIP NAT pinging setbflag(FLB_NATSIPPING); } # 7/28/11 - make sure only one contact location is active # at any given time # unregister("location", "$rU"); if (isbflagset(FLB_NATB)) { xlog("L_ALERT", "REGISTRAR: For $fU, $fd FLB_NATB set"); }

            if (isbflagset(FLB_NATSIPPING))
            {
                    xlog("L_ALERT", "REGISTRAR: For $fU, $fd

FLB_NATSIPPING set"); }

            if (!save("location"))
            {
                    xlog("L_ALERT", "REGISTRAR: From $fU, $fd  Location

could not be saved"); sl_reply_error(); }

            exit;
    }

}

The debug log snippets

Oct 1 15:58:30 siptest /usr/sbin/kamailio[19515]: ALERT: <script>: REGISTER: From p_krishna_test_com, 50.62.1.7 To p_krishna_test_com, 50.62.1.7 Oct 1 15:58:30 siptest /usr/sbin/kamailio[19515]: ALERT: <script>: REGISTRAR: For p_krishna_test_com, 50.62.1.7 FLB_NATB set Oct 1 15:58:30 siptest /usr/sbin/kamailio[19515]: ALERT: <script>: REGISTRAR: For p_krishna_test_com, 50.62.1.7 FLB_NATSIPPING set Oct 1 15:58:30 siptest /usr/sbin/kamailio[19515]: DEBUG: sl [sl.c:278]: reply in stateless mode (sl)

Output of kamctl command

$ sudo kamctl ul show Domain:: location table=512 records=1 max_slot=1 AOR:: p_krishna_test_com Contact:: sip:p_krishna_test_com@75.62.17.45:50073;transport=tcp;ob Q= Expires:: 287 Callid:: ad2d3a7bf39a4345861db1661576a7f3 Cseq:: 54856 User-agent:: QliqDesktop 1.0.0 (pjproject 1.10.0/win32) State:: CS_NEW Flags:: 0 Cflag:: 0 <================= Cflag is not being set. Socket:: tcp:10.1.0.6:5060 Methods:: 8143

Thanks Krish Kura