Patent ID: 6035026
Filing Date: 2000-03-07
Classification: H04M

Abstract:
A method for call conferencing a plurality of multiline subscribers in a telephone exchange system, comprising the steps of:providing at least one phone number jointly for a plurality of multiline subscribers and at least one common key, each common key representing a corresponding joint phone number;pressing at least one common key corresponding to a joint phone number to set up a conference call by one multiline subscriber of said plurality of multiline subscribers while another multiline subscriber of said plurality of multiline subscribers is presently communicating with a first subscriber or in the process of making a conference call to the first subscriber;verifying a service class of the another multiline subscriber and the first subscriber to approve a conference group among the another multiline subscriber, the first subscriber, and the one multiline subscriber;call conferencing the conference group if approved in the verifying step; andignoring a conference call for the conference group if in the verifying step the conference group is not approved.