Re: [OpenSER-Users] How to avoid malicious BYE that update accounting "StopTime"? - sr-users

10 Feb 2008

At 18:39 08/02/2008, Alex Balashov wrote:

...
 On Fri, February 8, 2008 11:17 am, IÃ±aki Baz Castillo
wrote:

  - But now imagine that user B sends a BYE after 2
hours using the same
 From&To tags and Call-ID. This is terrible!!!  OpenSer will notify a
 "Stop" action 
Why would it do that?  Call-IDs are supposed to be GUIDs (Globally Unique
Identifiers) and never reused.  You shouldn't really be seeing collisions
of them on a UA that properly implements the generation algorithm for them
and fulfills the requirements of the RFC on this point. 
You should not, but you do.

Anyhow, I think the confusion is of architectural nature here. IMO, usage-based 
charging if placed anywhere than in the place where the charged service is actually
produced and not in a proxy to it, which may not have accurate information. I.e.,
put CDR stuff in PSTN gateway.

-jiri

--
Jiri Kuthan            http://iptel.org/~jiri/