[OpenSIPS-Users] Restrict Simultaneous-Use

[Iñaki Baz Castillo]

2009/3/5 Bogdan-Andrei Iancu <bogdan at voice-system.ro>:
> Hi Robert,
>
> You do not need Radius for this. OpenSIPS can do this by itself. See a
> nice tutorial on this topic:
>    http://www.opensips.org/index.php?n=Resources.DocsTutConcurrentCalls

Hi, this is very interesting but I wonder how "dangerous" is a proxy
trying to count the simultaneous calls.

If for example alice calls to bob through OpenSIPs, how can OpenSIPS
know if the call is really alive or not? imagine neither alice or bob
are using SessionTimers.

OpenSIPS cannot assume that it will receive an in-dialog request which
would refresh the dialog expire time, so this time must be very long
(hours). What about if alice and bob crash without sending a BYE? The
call will remain "alive" in OpenSIPS until the dialog expires (various
hours), so alice couldn't call bob again during this time.


-- 
Iñaki Baz Castillo
<ibc at aliax.net>