[OpenSIPS-Users] - topology_hiding and no ACK

[Nitesh Divecha]

Hello All,

I don't know if this is by design or me not implementing correctly! I'm a
newbie to OpenSIPS...

So I generated a new opensips_residential.cfg file and only edited it
with topology_hiding("UC"); under INVITE. Plus all the extras to make ATA
register successfully and SIP trunk.

Every time I make a call two INVITE dialogs are created. One from ATA to
OpenSIPS and second one from OpenSIPS to Outbound Provider. When a PSTN
call is answered, the Outbound Provider sends 200 OK back to OpenSIPS, and
OpenSIPS sends back 200 OK to ATA. Then ATA acknowledges with ACK back to
OpenSIPS BUT OpenSIPS fails to send ACK to the Outbound Provider. So
Outbound Provider sends 200 OK again to OpenSIPS and OpenSIPS sends 200 OK
to ATA then ATA acknowledges with ACK back to OpenSIPS BUT OpenSIPS fails
to send back ACK... This dance goes on for 30 secs and until Outbound
Provider drops the call due to no ACK.

On the sngrep it shows that call from ATA to OpenSIPS "COMPLETED" while
OpenSIPS to Outbound Provider "CALL SETUP".

If I comment out topology_hiding("UC"); then everything works perfectly and
sngrep shows only one INVITE dialog from ATA to OpenSIPS to Outbound
Provider except the Outbound Provider can see everything that is ATA's IP
info, etc...

Here is my cfg:

route {
...
if (dp_translate(10 ,$rU ,$rU) ) {
                xlog("*** Dial plan translate from source $avp(src) to $rU
***\n");

                $avp(furi) = "sip:xxxxxxxxxx at gothamcity.com";
                uac_replace_from( , "$avp(furi)");
                #strip(1);
                if (!do_routing(0)) {
                        send_reply(500,"No PSTN Route found");
                        exit;
                }
                # t_on_branch("change_from");
                route(relay);
                exit;
        }
...
}

route[relay] {
        # for INVITEs enable some additional helper routes
        if (is_method("INVITE")) {
                # create_dialog();
                topology_hiding("UC");
                if(remove_hf("User-Agent")){
                        xlog("*** 4. User-Agent found and removed. ***\n");
                }

                if (isflagset("NAT") && has_body("application/sdp")) {
                        rtpproxy_offer("ro");
                }

                t_on_branch("per_branch_ops");
                t_on_reply("handle_nat");
                t_on_failure("missed_call");
        }

        if (isflagset("NAT")) {
                add_rr_param(";nat=yes");
        }

        if (!t_relay()) {
                send_reply(500,"Internal Error");
        }
        exit;
}

My eyes are sore and my head is spinning... Any help will be highly
appreciated... Thanks!

Cheers,
Nitesh
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