[OpenSIPS-Users] B2B user agent logic

[Donat Zenichev]

First of all thanks for your replies Răzvan and Ben.

Ben, the case with local_route might be the thing I need. I read a bit on
the matter, but haven’t digged into it deeply yet.
I will try to play with this, one of these days, and will share my
experience to OpenSIPS community.

>From what I got, local_route first of all gives a possibility to catch and
then edit messages coming to B2Bua. Am I wrong?

Răzvan, yes topology hiding module fits this demand and I guess this is
even more simple implementation in comparison with B2B.

The idea I’m trying to follow, is that OpenSIPS plays a role of a routing
server for a border controller. And the border controller in its turn can
consider an INVITE (with already changed destination) having the same
call-id as a loop.
Thus routing solution can be implemented using two ways:
- 3XX redirection server
- B2BUA that divides a call into two legs

I guess, topology hiding module fits the second case (when I need to divide
a call) just fine.

I will try both ways with topology hiding module and local_route of b2b
module(s) and see which one fits better.
Of course I will share my experience in the end!

Have a nice day!




On Fri, 10 Jan 2020 at 5:43 PM, Răzvan Crainea <razvan at opensips.org> wrote:

> Hi, Donat!
>
> Indeed, the B2B module(s) are not compatible with the dialog module.
> However, if your purpose is just to have different callids between the
> two legs, why not using the topology hiding module[1], which does change
> the callids (using the "C" flag for the topology_hiding() function[2])
> and is built on top of the dialog module.
> The B2B does indeed offer a similar behavior, but it is usually used for
>   much more complex calling scenarios - if you don't need those complex
> scenarios, simply use the topology_hiding mode.
>
> [1] https://opensips.org/html/docs/modules/3.0.x/topology_hiding.html
> [2]
>
> https://opensips.org/html/docs/modules/3.0.x/topology_hiding.html#func_topology_hiding
>
> Best regards,
> Răzvan
>
> On 1/10/20 5:21 PM, Donat Zenichev wrote:
> > Hello OpenSIPS community!
> >
> > I have a brief question regarding how to better implement B2B user agent
> > logic, within OpenSIPS installation.
> >
> > The goal is quite simple:
> > - I have OpenSIPS as a routing system (making decisions on calls)
> > - OpenSIPS at the same time separates dialog into two legs (so two
> > Call-IDs as result)
> >
> > Firstly I've started looking into b2b_logic + b2b_entities modules
> > I read manuals provided by OpenSIPS dev team and everything is quite
> > clear for me.
> >
> > But, from what I understand provided b2b module is not compatible with a
> > dialog module
> > (paragraph 6 at Back-to-Back User Agent manual).
> > But dialog module is quite significant for me, at least since of
> > "dialog_replication_cluster" parameter.
> >
> > Another feature of the b2b_logic module is, that it only implements
> > scenarios within a separate xml configuration file. And from the script
> > routing you're only able to access coming requests and responses in a
> > read-only mode.
> >
> > To sum up, the general goal is to separate call into two legs, to let
> > both legs have different call-ids. And it's also quite important to be
> > able to rule changes on requests (e.g. resetting of R-URI) from the
> > routing script.
> >
> > Everything from mentioned above led me to a thought, that there could be
> > some much elaborate solution for implementation of B2B within OpenSIPS
> > installation.
> > For sure b2b_logic and b2b_entities modules are great! But still I'm
> > looking for a bit different installation.
> >
> > I know, OpenSIPS is a SIP proxy and it's not supposed to be run with a
> > role of B2BUA.
> > But still, might be someone can share his/her own experience and hint
> > some better way out for this?
> >
> > Many thanks in advance and have a nice day!
> >
> >
> >
> > --
> >
> > Best regards,
> > Donat Zenichev
> >
> >
> > _______________________________________________
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> > Users at lists.opensips.org
> > http://lists.opensips.org/cgi-bin/mailman/listinfo/users
> >
>
> --
> Răzvan Crainea
> OpenSIPS Core Developer
>    http://www.opensips-solutions.com
>
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>
-- 

Best regards,
Donat Zenichev
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