[OpenSIPS-Users] B2BUA and SBC - Best practice

[Carlo Dimaggio]

Hi all,

I'm designing a new VoIP platform in which transcoding and prepaid 
features must be provided.
One essential component of the architecture will be a b2bua, but I'm 
wondering about where it should be deployed. In detail, I'm thinking 
about a "standard" architecture (opensips + mediaproxy) with a b2bua 
(freeswitch) used for media transcoding, prepaid, topology hiding and 
media services.
What is the best practice in this case? I could design the architecture 
in two ways:

1)
         Users            Providers/PSTN
             ||                      ||
         Opensips/Mediaproxy <==> B2BUA

         (here opensips/mediaproxy+B2BUA acts as a whole SBC)

2)
         Users            Providers/PSTN
             ||                        ||
                     B2BUA
                         ||
             Opensips/Mediaproxy

             (here the B2BUA should works also as SBC and could do 
protocol interworking (es h323) but which component should 
authenticate/authorize the users? I would like to handle all subscribers 
just in opensips)


If I use a b2bua for all sessions, do I still require a media proxy for 
nat traversal?

Thanks for your hints.

Best Regards,
Carlo Dimaggio

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