[OpenSIPS-Users] Record-Route and Dialog topology_hiding()

Bogdan-Andrei Iancu bogdan at opensips.org
Wed Jul 27 09:59:52 CEST 2016

Hi Ben,

As I mentioned in different thread, TH is not compatible with the RR 
mechanism. If you do TH, your OpenSIPS will act as and end point (from 
SIP perspective), so there will be no Route/RR headers at all. So no 
need to do loose_route or so. You just do TH matching for the sequential 
requests and nothing more.


Bogdan-Andrei Iancu
OpenSIPS Founder and Developer

On 22.07.2016 16:48, Newlin, Ben wrote:
> Hi,
> I am using the Dialog module with topology_hiding() in my server and I 
> have a need to Record-Route the call on my server as I am advertising 
> a different address than I am listening on. I have found what I 
> believe is an inconsistency in the handling of Record-Route within the 
> Dialog topology_hiding functionality. The topology_hiding isn’t a true 
> B2BUA, but it does set up different parameters for the incoming UAC 
> and outgoing UAS sides of the call for the Via headers, Record-Route 
> and Route headers, and the Contact header(s).
> The problem is that the record_route() and loose_route() functions 
> operate on different sides of the call. The record_route() function 
> will only add a Record-Route header to the outgoing UAS side of the 
> call. And since the record_route() function cannot be called from 
> onreply_route, but is no way to add a Record-Route header to the UAC 
> side of the call.
> On the other hand, the loose_route() function only operates on the 
> incoming UAC side of the call and there is no way to perform 
> loose_route() on the UAS side of the call.
> So there is a situation where Record-Route headers can only be added 
> on the outgoing UAS side, but the associated Route headers can only be 
> removed on the incoming UAC side (where they won’t exist since they 
> can’t be added) and any added headers on the UAS side cannot be 
> processed properly due to the lack of loose_route.
> I can provide further information if this is unclear. It should be 
> easily reproducible by attempting to use record_route in a 
> topology_hiding scenario. The route is added to the outbound leg, but 
> is not removed by loose_route so the message is looped back every time.
> *Ben Newlin***| Sr Voice Network Engineer, PureCloud
> phone & fax +1.317.957.1009 | ben.newlin at inin.com
> www.inin.com <http://www.inin.com/>
> _______________________________________________
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> Users at lists.opensips.org
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