新的商业模式包括音乐订阅服务：消费者每月支付5到10美元的费用，从而能够无限畅听在线音乐库中的歌曲，但是不能保存它们。
The latter include subscription services that, for a flat monthly fee of $5 to $10, give consumers unlimited access to an online library of songs that they can play but cannot keep.
在请求者和发布者中介之间的点到点交互模式中，如果请求者已经使用发布/订阅交互模式（如图 2 所示），该如何呢？
What if, in the point-to-point interaction pattern between the requester and publisher mediation, the requester already uses a publish/subscribe interaction pattern, as shown in Figure 2?
应用这一模式，可以解决诸如如何将物理设备事件、托管数据更新事件和其他语音相关事件通知给多个订阅者等问题。
Problems such as how to notify multiple subscribers of physical device events, managed-data update events, and other telephony-related events were solved by applying this pattern.
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