There is no conference master for the station controlled conference of OpenScape 4000 the Paying-Party for each part call of the conference will be the corresponding conference convener. The convener will remain as Paying-Party for his branch also when he has left the conference already.

A Charge Display will be sent to the convener only when he drops out of the conference. A convener will get no further Charge Displays after he has left the conference, even though he may continue to be the paying party for some remaining conference legs.

Because of the fact that for each part call of the conference the corresponding convener will be the Paying-Party INCDR can not summarize all the costs of all COSTI buffers administrated in one COSTI buffer administration table and send the resulting cost amount to the display of the conference master.

For station controlled conference INCDR must identify all COSTI buffers with the same Paying-Party summarize the costs and send the resulting cost amount to the display of the responsible conference convener.