在Context Awareness 系統中，其中有一個基本要素：得知一個設備（行動或是固定）的地理位置，而在此篇論文中，我們將會提出GLASS，
一個基於SIP 的地理位置感知服務。此為FULL 的一部份計畫，在FULL整體計畫中，將建立一普及運算環境，以及應用程式與服務的開發。這樣的環境包括了Ubiquitous 環境與中介軟體，使使用者可在其上提供服務與開發應用程式。
　　GLASS 是由兩部分所組成：SIP-based Device Location Server（SDLS）與Geographical Location Server（GLS）。SDLS 會根據行動設備所連上網路的方式（Ethernet、Wireless LAN 或GPRS）提供中介地理位置（Meta-Geographical Location），GLS 對此中介地理位置進行演算而得到真正的地理位置。
　　而此系統則是建構於階層式SIP 環境之上，故可減少行動設備在切換與漫遊的時間。而使用SIP 使得在FULL 之上的開發人員不用專注於IPAddress 的變化之上，以SIP URI 取而代之。

　To know the location of a device (mobile or fixed) in Internet is a basic feature for a context awareness system. In this paper, we will describe the work done for constructing GLASS (Geographical Location Awareness Service based on SIP). It is a part job of a project called FULL (a Fantastic Ubiquitous Living Land). In this project, a pervasive computing environment will be built and an application will be provided to see if the built environment is applicable. The environment includes a ubiquitous communication environment and a middleware for building an application.
　GLASS consists of two parts: SIP-based Device Location Server (SDLS) and Geographical Location Server (GLS). SDLS will give the address of a device in term of Meta-Geographical Location (i.e. an AP list, IP Address, or a BTS list) in wireless LAN, Ethernet, or GPRS. SDLS also keeps the track of a mobile device, when it roams around the network. The network connection of a mobile is always connected. The horizontal and personal handoffs are provided. GLS maps a device address into a geographic location. The hierarchical structure of location management is used, so that the handoff of local roaming can be speedup. The standard operation of SIP (Section Initial Protocol) and a device location query command are encapsulated as a middleware, so that the application of FULL can be easily developed.

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