Patent ID: 7221662

Claim:
A communications system comprising: a first interface establishing device connected between the first network control device and a transmitting network; wherein a first communication device and said first network control device are connected such that a use signal and a control signal are sent separately to said first network control device; said first network control device and said first interface establishing device are connected such that said use signal and said control signal are sent separately to said first interface establishing device, said first interface establishing device is configured to send said control signal over said transmitting network and comprises a compressing unit configured to compress said use signal, the compressed signal being sent over said transmitting network; and a tone generation unit is provided on the far-end side of the network configured to receive said control signal after transmission through said transmitting network and to generate a tone signal in response to said control signal wherein a second interface establishing device connected to said transmitting network; and a second network control device; wherein said second interface established device comprises a decompressing unit configured to decompress said use signal received via said transmitting network; a control transfer unit configured to receive said control signal and sending said control signal to said second network control device; and a second communication device, wherein said second interface establishing device is configured to send said use signal to said second network control device, and said second network control device is configured to send said control signal and said use signal separately to said second communication device.