| 摘要 |
In a communication system, the improvement comprising a plurality of us er data files for respective users each user data file including at least one role identifier; a plurality of communication groups having respective group name identifiers f or associating predetermined roles with the groups and respective group phone numbers; and a role list data file for automatically associating respective ones of t he users with a predetermined one or more of the communication groups according to the at least one role identifier.
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