[OpenSIPS-Users] on routing invite's in a trunk context.

[Ben Newlin]

Johan,

This is actually a pretty standard SIP flow that we use all the time. I recommend this article [1] for an overview of how routing works in SIP.

In short, the Contact and Record-Route headers are only used for routing of requests not responses, and mostly only sequential requests which are requests within a dialog. The topology_hiding_match and loose_route functions both operate on requests only, so they can both only be called from a request_route [1] [2].

The 200 OK is a response within the initial INVITE transaction. Responses within a SIP transaction are routed based on the source IP of request and/or the Via headers. OpenSIPS should just handle that for you, unless you have some strange routing.

[1] https://kb.smartvox.co.uk/opensips/contact-and-record-route-headers-explained/
[2] https://opensips.org/docs/modules/3.2.x/topology_hiding.html#func_topology_hiding_match
[3] https://opensips.org/docs/modules/3.2.x/rr.html#func_loose_route

Ben Newlin

From: Users <users-bounces at lists.opensips.org> on behalf of johan <johan at democon.be>
Date: Friday, October 6, 2023 at 10:30 AM
To: OpenSIPS users mailling list <users at lists.opensips.org>
Subject: [OpenSIPS-Users] on routing invite's in a trunk context.
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This is a general question on routing (to be honest: it is a really
strange case).


A has a sip trunk to B (opensips), B has a sip trunk to C



A sends an invite to B with contact header A'   and record-route header
to A''

B string the record_route header , calls topology hiding and droutes the
call to C

C sends 200 OK back but it needs to be routed on the content of the
contact header.


Now how does this route to A ?   Is this the default
topology_hiding_match() case ? Or do I need to do something special ?






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