[cisco-voip] E1 call Fraud + h.323 Gw

[Jawad A Hai]

Hello Group,

Recently I faced a problem with one of my client, who has got E1r2, DID/DOD.
He has Cisco CME and Cisco Voice Gateway.
Suddenly all 30 ports got busy with international calls. All the calls are being generated by ONE IP Phone which has got local extension 2000.
This extension was translated to DID number, so that any call goes out via this number takes the DID and any call comes on this DID will land on this Phone.
The CME was configured to access via outside with live IP. ie Live IP to Local IP (NAT).
Now the thing here is all the calls which were generated are international calls, we rebooted the gw, we rebooted the CME it stayed same..once it reboots all 30 ports got busy with international calls.
calls going to african countries/russian countries( dial codes belongs to these countries).
When I changed the international dial peer on the CME they stopped.
But catch here is they have received more than 100 k USD bill from TELCO.  DEAD DEAD Bang Bang.
What are the chances of toll Fraud or any other way of hacking ?
OR could it be TELCO side issue?
Cuz I see mostly calls are being generated by single DID number ??

Aali
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