[OpenSIPS-Users] - topology_hiding and no ACK

[Bogdan-Andrei Iancu]

Hi Nitesh,

Do you do topology_hiding_match() for the sequential requests (instead 
of the typical loose_route()) ?  As it seems you cfg fails to properly 
handle the in-dialog / sequential requests.

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
OpenSIPS Bootcamp 5-16 Dec 2022, online
   https://www.opensips.org/training/OpenSIPS_eBootcamp_2022/

On 10/26/22 9:05 PM, Nitesh Divecha wrote:
> 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");
>
>               $avp(furi) = "sip:xxxxxxxxxx at gothamcity.com 
> <mailto:sip%3Axxxxxxxxxx at gothamcity.com>";
>               uac_replace_from( , "$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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