Call Clearing for legacy mobile circuit switched domain wireless systems

A telecommunications system having at least a first PS network and a second PS network and a third circuit-switched core network, and a system for terminating a legacy domain circuit-switched communication upon receipt of a trigger signal requesting termination of communication, the system for terminating a legacy domain circuit-switched communication, comprising:

• a first functional and a second functional entity in each of said first and second networks;
• said first functional entity and said second functional entity of said first network including means for communicating signals over an interface using a PS protocol;
• said first functional entity and said second functional entity of said second network including means for communicating signals over an interface using a PS protocol;
• said first functional entity of said first network having means for communicating packet data to and from said first functional entity of the second network;
• said second functional entity of said first network having means for communicating a PS protocol signal to said second entity of said second network;
• and
• said second functional entity of said second network further including means for communicating a circuit-switched protocol signal to and from said third circuit-switched protocol core network to terminate said circuit-switched communication.

In a telecommunications system having at least a first PS network and a second PS network and a third circuit-switched core network, each of said first and second networks having first and second functional entities, a method for terminating a legacy domain circuit-switched communication upon receipt of a trigger signal requesting termination of communication, comprising the steps:

• communicating a PS protocol signal between said first functional entity and said second functional entity of said first network over an interface;
• communicating a PS protocol signal from said second functional entity to said first functional entity of said first network over an interface to control termination of communication of packet data by said first functional entity of said first network;
• communicating a PS protocol signal from said first functional entity of said first network to said first functional entity of said second network requesting termination of the communication of packet data by said first functional entity of said second network;
• communicating a PS protocol signal from said second functional entity to said second functional entity of said first network over an interface to control termination of communication of packet data by said first functional entity of said second network;
• and
• communicating a circuit-switched protocol signal from said first functional entity of said second network to said third circuit-switched protocol core network to terminate communication with said third network.