[Serusers] SER RADIUS Accounting and B2BUA

[Mohamed Omar]

when using Cisco for billing and teardown, how do you over come the limitation of hairpinning Voip leg to Voip leg call on a cisco router if your are not connected to a PSTN network and you have to terminate on someone else gateway?
 
Thanks
 
Mohamed.

Alistair Cunningham <acunningham at integrics.com> wrote:
Matt,

Because SER handles SIP messages, not RTP streams, it cannot 100% 
accurately record CDRs. For instance, if the BYE message is lost because 
a client crashed, SER has no way of knowing when the call ended or how 
much it cost. A BTBUA gets round this problem by having the RTP packets 
come to it, so if a client crashes, the RTP stream stops and the BTBUA 
knows the call has finished. The disadvantage of a BTBUA is that it adds 
latency and doesn't scale well, because it needs to handle all the RTP 
traffic.

I install quite a few SER and Asterisk systems for my customers, and a 
fix for this issue is the most frequent item I'm asked for. It's 
unavoidable, however, if one wants SER's scalability. What I usually 
recommend for them is to install a SER system (for scalability, 
registrations, routing of calls that don't need a CDR, etc) fronting 
multiple BTBUAs such as Asterisk or Cisco (for accurate billing of PSTN 
calls).

Alistair Cunningham,
Integrics Ltd,
Telephony, Database, Unix consulting worldwide
+44 (0)7870 699 479
http://integrics.com/


matt morris wrote:
> Hello List,
> 
> Just wondering, what is the radius account module for SER not able to 
> do, that would require the use of B2BUA in terms of having a CDR? 
> Forgive me if it is a dumb question...
> 
> Thanks.
> 
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