Michael
Difficulty is identifying them. The CLI is continually changed so it is not possible to identify by CLI and the call type is lied about by the originating operator. So calls originated abroad do not show as International in the signalling message.
OFCOM are recently suggesting that for calls in the VOIP space they will expect operators to check that the originating range is valid and will allow operators to 'drop' calls that have CLIs within ranges that have not been allocated by OFCOM.
They have also threatened to fine operators that have control of number ranges where these are being used to originate these calls, unless they cut the offending customer off. This cannot affect those originated abroad where most originate.
The only way to cut down on calls from abroad is to enforce the correct signalling parameters on the transit operators and start to fine those that do not provide the international type when calls are coming from abroad. If this happens and you have barred international calls on your call barring device this would reduce the calls to a small number. However this is quite difficult to do on VOIP calls as where they originate is not always clear. ( Think VPNs)



Pages in this thread:
Print Thread
kitcat