| 摘要 |
A user of a terminal wanting to establish a conference call notices for instance through a presence service that the group or one or more members of a group are not available and requests a group call server to keep track of the presence status of the members of the group and to originate a conference call once all of the members are present. Rules may be established to define under what circumstances the call should be started and which rules may include making the call when every member or a certain percentage of the group is available, how long the call attempt is effective, or the time the request is effective.
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