Charging system in data communication network

Claim 2

A charging system in a data communication network comprising: first means for negotiating, prior to effecting a data communication between a calling terminal and a called terminal via the network, a charge ratio between charges for the data communication to be paid by the calling and called terminals and allowing said calling terminal to initiate the data communication on an agreement between said calling terminal and said called terminal for the charge ratio; second means for charging said calling terminal and said called terminal based on the charge ratios at a disconnection of the call; and third means for respectively notifying the charge information to said calling terminal and said called terminal.

Claim 3

A charging system according to claim 1 wherein said first means includes: means for sending to said called terminal a first packet containing information indicating a first charge ratio at which the calling terminal desires to divide the charges for the data communication between said calling terminal and said called terminal; means for sending from said called terminal, in response to said first packet, to said network a second packet containing information indicating a second charge ratio desired by said called terminal, said second charge ratio either the same as said first charge ratio or another charge ratio different from said first charge ratio; and means for enabling said network in response to a reception of said second packet to effect a data communication between said calling terminal and said called terminal and for sending to said calling terminal a third packet containing information indicating the possibility of the data communication therebetween via the network and a third charge ratio which is the same as said second charge ratio; whereby said calling terminal, on receiving said third packet, can select whether the data communication is to be initiated by agreeing on said third charge ratio or the call for the data communication is to be cancelled by disagreeing on the third charge ratio.

Claim 4

A charging system according to claim 2 further including fourth means for causing said network, upon receiving said second packet, to store in a memory of said network said second charge ratio and wherein said second means charges said both terminals at said second charge ratio assuming that both terminals agree on said second charge ratio.