[Serusers] prohibit gateway access - question

[Jan Janak]

On 15-03 11:42, Klaus Darilion wrote:
> Hi!
> 
> I've got a small problem and don't know how to solve it best, so I would 
> appreciate your comments:
> 
> I want to allow my ser users to call any IP destination for free and 
> always, but I want to restrict access to the PSTN. Therefore, I 
> authenticate, account and check if user is in PSTN group before 
> forwarding to the gateway (local GW or the GW of an PSTN termination 
> provider).
> 
> But, for example if one of my users call 1234567 at anydomain.com and this 
> domain resolvs to the IP address of the gateway, the request would be 
> forwarded to the gateway, and the GW would accept the call as it comes 
> from a trusted SIP proxy. How can I prevent this?

  Perhaps the gateway could refuse messages which don't have the IP
  address of the gateway in the Request-URI ? In this case
  1234567 at mydomain.com would be refused even if it is coming from a
  trusted proxy.

    Jan.