[OpenSIPS-Users] Questions about best practice b2b_logic implementation

[Ovidiu Sas]

Hello Denys,

Dialog module should *never* be mixed with the b2b module.
For b2b calls one can use the $b2b_logic.ctx vars [1].
For b2b tracing use the 'b' scope in trace() [2].
There are some issues as not all provisional replies are traced [3].
Custom headers can be set for each b2b_entity during the entity setup
via the extra_hdrs and extra_hdrs_bodies [4] [5].
For now, the outgoing socket is set by opensips internally. There were
some fixes related to this, make sure that you are using the latest
opensips version.

-ovidiu

[1] https://opensips.org/docs/modules/3.4.x/b2b_logic.html#b2b_logic.ctx
[2] https://opensips.org/docs/modules/3.4.x/tracer.html#func_trace
[3] https://github.com/OpenSIPS/opensips/issues/3194
[4] https://opensips.org/docs/modules/3.4.x/b2b_logic.html#func_b2b_server_new
[5] https://opensips.org/docs/modules/3.4.x/b2b_logic.html#func_b2b_client_new


On Wed, Oct 18, 2023 at 9:16 AM Denys Pozniak <denys.pozniak at gmail.com> wrote:
>
> Hello!
>
> I'm trying to implement topology hiding (b2b_logic) in an existing config, but there are points that are not clear to me:
> - Can I somehow use dialog variables in b2b mode? if not, any alternative? I see they are created for the initial leg (with state=3), but not available in the b2b mode;
> - How to configure a tracer (proto_hep) in b2b mode?
> - How to convert transport and select outgoing socket (the question has already been asked in a separate mail)?
> - How can I add the necessary custom X-headers also for in-dialog requests (for example, for re-INVITE)? It does not work via insert_hf in [script_req_route] neither via function b2b_client_new() as well;
> - If nodes operate in anycast + clusterer mode, then in what route should function t_anycast_replicate() be called?
>
> --
>
> BR,
> Denys Pozniak
>
>
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