[OpenSIPS-Users] opensips-cp CDR correlation

[Adrian Georgescu]

> Let me explain an example:
>
> - Two users with STUN or public IP so no media-proxy is required in
> order to get audio properly.
> - But me (the provider) want to account a call between them (perhaps
> not for billing, but for any other reason).
>
> Solutions for *secure* accounting:
>
> a) Use of a media-proxy (but this requires a media-proxy... and I
> don't want it since it's not needed for getting audio).
>
> b) One of both phones use SessionTimer (this depends on the clients,
> obviously not a "secure" solution for me).
>
> c) Me (the provider) use a transparent B2BUA in the middle of the call
> so the B2BUA forces SessionTimers for leg_A (phone 1) and leg_B (phone
> 2).
>
> Option c) ensures, just with SIP signalling, that the accounting is
> accurate without the need of a media-proxy (which could add delay and
> consumes *my* network resources).

What you describe can work technically but seem to require cooperation  
from the end-points. Is the goal to have reliable accounting for when  
the network has problems or when the users miss-behave?

Adrian