These devices are heterogeneous and includes IP and analog phones, PDAs, set-top boxes (STB), PCs, DSL or Residential Gateway modems, Wireless Access Point routers, TVs, and so on.
这些设备各种各样，包括 IP 及模拟电话、PDA、 机顶盒（Set-Top Box，STB）、PC、DSL 或家庭网关（Residential Gateway）调制解调器、无线接入点（Wireless Access Point）路由器、TV 等。
This paper mainly described on IP-based set-top boxes how to implement SIP-based PRESENCE service.
论文主要阐述了在IP机顶盒上基于SIP协议的PRESENCE业务的实现。
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