Radio communication network and method for unobstrusive call interception via data duplication

A method of unobtrusively intercepting a call routed through a radio link of a telecommunication network, the method a comprising the steps of:

• a) establishing the call and a departing portion of a call path between a subscriber unit and a second device;
• b) obtaining call data at the subscriber unit;
• c) compressing the call data at the subscriber unit to obtain compressed call data;
• d) transmitting the compressed call data to a network node using an RF communication link;
• e) duplicating the compressed call data at the network node to obtain first compressed call data and second compressed call data;
• f) routing the first compressed call data from the network node toward the second device;
• g) routing the second compressed call data toward a monitoring center;
• and
• h) refraining from performing more than one compressing operation within the departing portion of the call path.

A network allowing unobtrusive interception of a call established between a subscriber unit and a second device, the network comprising:

• a plurality of network nodes in communication with one another, wherein one of the network nodes is in radio communication with the subscriber unit, one of the network nodes is in communication with the second device, and one of the network nodes is a duplicating node, wherein the duplicating node comprises:
• means for duplicating compressed call data received from the subscriber unit into first compressed call data and second compressed call data;
• first routing means, coupled to the duplicating means, for routing the first compressed call data toward the second device and for refraining from performing more than one compressing operation within a departing portion of a call path;
• and
• second routing means, coupled to the duplicating means, for routing the second compressed call data toward a monitoring center.

A network allowing unobtrusive interception of a call established between a subscriber unit and a second device, the network comprising:

• a plurality of network nodes in communication with one another, wherein one of the network nodes is in radio communication with the subscriber unit, one of the network nodes is in communication with the second device, and one of the network nodes is a duplicating node, wherein the duplicating node comprises:
• duplicator capable of duplicating compressed call data received from the subscriber unit into first compressed call data and second compressed call data;
• first router, coupled to the duplicator, capable of routing the first compressed call data toward the second device and for refraining from performing more than one compressing operation within a departing portion of a call path;
• and
• second router, coupled to the duplicator, for routing the second compressed call data toward a monitoring center.