[Serusers] SER / MediaProxy / B2BUA

sip sip at arcdiv.com
Tue Jul 4 23:03:17 CEST 2006

All Asterisk B2BUA does, really (I'm referring to the script, not the Asterisk
patch itself), is authenticate a call coming in, and then lookup in radius
what the session timeout for that call should be. It then creates an Asterisk
dial string and sets the call timeout to be X number of seconds based on the
session-timer attribute in radius. 

If media proxy allows you to set session timers on the fly or has some sort of
polling system (I don't know, I've never used it), allowing you to terminate a
call after a certain period of time, then no, you wouldn't need Asterisk B2BUA. 

We actually ended up only partly using Asterisk B2BUA for our stuff, because
it didn't quite do everything we wanted (it's really only a B2BUA and it
relies rather heavily on some odd conventions in radius for authentication
without a password (not really authentication)), so we coded our own setup
which keeps track of session timeouts and call costs and the like and then
uses the Asterisk B2BUA framework to create the Asterisk dial string.  At this
point, there's no real reason we couldn't replace the whole thing with our own
code (it became 95% ours in the process, but the process would have gone
NOwhere without the original code to set us in the right direction). If you're
in a similar situation with mediaproxy, and it allows session timers of some
sort, there's no real reason to NOT use your own setup. 


On Tue, 4 Jul 2006 16:51:12 -0400, Daniel Salama wrote
> After reading this forum:
> http://www.voipuser.org/forum_topic_4468.html
> it made me wonder, whether or not you really need B2BUA if you  
> already have Mediaproxy in your environment. I know the purpose of  
> Mediaproxy is to help with NAT situations. However, given the fact  
> that Mediaproxy is always in the media path, couldn't it be ALSO 
> used  to "terminate" a call in progress, the same way that B2BUA 
> can? And  by B2BUA I refer to the Asterisk B2BUA, all within the 
> context of  prepaid type services.
> Any comments?
> Thanks,
> Daniel
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