Method, mobile switching centre, MSC, and a computer program product for detecting interconnect bypass

A Mobile Switching Center (MSC) arranged for operation in a telecommunication network, and for detecting interconnect bypass by a subscription identity in said telecommunication network, said MSC comprising:

• communication circuitry configured to communicatively couple said MSC to one or more other nodes in said telecommunication network;
• and
• processing circuitry operatively associated with said communication circuitry and configured to:
• set a bypass threshold value, said bypass threshold value being an integer number;
• receive, by said MSC, a grey list from any of a Home Subscription Server (HSS), a Home Location Register (HLR), and an Application Server (AS), and enter said grey list at said MSC, wherein said grey list contains subscription identities suspected of involvement with interconnect bypass;
• monitor for originating calls per a pre-defined time, from each of one or more subscription identifies contained in the grey list that connect to the MSC;
• and
• detect when said number of originating calls for any one of said one or more subscription identities exceeds said bypass threshold value, thereby indicating an interconnect bypass by said any one of said one or more subscription identities.

A non-transitory computer readable medium storing computer program code that, when executed by a Mobile Switching Center (MSC) arranged for operation in a telecommunication network, cause said MSC to:

• set a bypass threshold value, said bypass threshold value being an integer number;
• receive a grey list from any of a Home Subscription Server (HSS), a Home Location Register (HLR), and an Application Server (AS), and enter said grey list at said MSC, wherein said grey list contains subscription identities suspected of involvement with interconnect bypass;
• monitor for originating calls per a pre-defined period of time, from each of one or more subscription identities contained in the grey list that connect to the MSC;
• and
• detect when said number of originating calls for any one of said one or more subscription identities exceeds said bypass threshold value, thereby indicating an interconnect bypass by said any one of said one or more subscription identities.