如果还不是成员，新的订户向服务提供者登记（建立一个帐户）。
The new subscriber enrolls (establishes an account) with the service provider if not already a member.
消费者向服务提供者登记，从目录选出所希望的服务，并且预订服务。
The consumer enrolls with the service provider, selects the service desired from the catalog, and subscribes to the service.
PIM服务器随后向诸如会议参与者的预约服务用户通知在网络上登记的服务提供者的标识。
The PIM server then notifies subscribing service users, such as conference participants, of the identity of the service provider that is registered on the network.
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